Kalki, Christ, Al Mahdi, Moshiach, Maitreya are actually different names and titles of the exact same person - the Christ Maitreya who has come as the Avatar of the New Age, not just for any specific religious group but for All men. But this is definitely NOT the End of the World. Far from it being the end, it will be a whole new glorious beginning.
Many Christians believe the Christ will return at the end of the world to take the faithful Christians to heaven in a 'rapture'. Why would God favor Christians over the other 4-5 billion humans - also his children? Why would a 'loving' God allow the world to be destroyed? - it is silly to believe all this. Actually Jesus will indeed return, but the rest of the story is completely untrue.
Muslims believe the Imam Mahdi will return as an Arab and lead the Muslims to victory over the unbelievers. Why would God favor Muslims over the other 4-5 billion humans? What is so special about Arabs?- it is just as silly to believe that.
Jews believe Moshiach will come and establish a Torah government in Israel which will be the center of the world. Jews may think they are 'chosen', but nobody can seriously believe that G-d prefers them to all the rest of humanity.
Hindus believe that Vishnu incarnates as a human periodically to save mankind from evil and that Kalki will be his final Avatar.
If God sends a Messiah, he will send one for all of humanity - Jews, Christians, Muslims, Hindus, Buddhists alike. He will definitely not favor any one group over the other. To believe this is to be deluded by a false sense of superiority (racial or religious) or of being more spiritual or righteous than other people - this is just not true - all individuals and groups are special in their own way, but definitely not more special than other groups.
Benjamin Creme of Share International has been speaking about the imminent open emergence of the Christ to the every day world for several years now. In December 2008, Creme revealed that the coming of the Christ would be heralded by the appearance of a star in the sky (similar to star that preceded the birth of Jesus). In 2009, thousands of people saw the star in sky in multiple location. In 2010, the emergence of Kalki, the Christ has finally occurred at last. On February 14th, Creme announced that the Christ or Maitreya had made his first open appearance and given an interview on an American TV show. Since that time, Maitreya has appeared on the same channel at least forty more times (He has also given several interviews on a channel in Mexico, many in Brazil, after that in Russia and now in China). He has come incognito without identifying himself as the Messiah. Though He does not belong to any nation, He has come as a Pakistani Muslim man. According to Creme, "He spoke earnestly of the need for peace, achievable only through the creation of justice and the sharing of the world's resources."
The Christ does not come to have people follow or worship him or to punish anyone. He is here to advise and teach, to show humanity a way out of the mess they have created for themselves on Earth. His message to mankind consists of this - without sharing of the world resources there can not be justice; without justice there can not be peace; without peace the world can not survive. He wants humanity to see itself as "One, brothers and sisters, and work together for the good of all". He wants the governments of all countries to guarantee the citizens of the world some basic human needs (food, shelter, health care and education) and also take better care of the planet and its environment. He also wants to correct many misunderstandings that have crept into our various religions about fate, life after death, heaven and hell and reassure men about God's infinite mercy and justice.
Some of the consequences of Maitreya's open presence in the world:
The spiritual level of the world will rise considerably - this also means unjust institutions, organizations, regimes will have difficulty surviving. The unjust, capitalistic financial and economic world order will be one of the first things to collapse. Undemocratic, dictatorial governments like China, North Korea, Burma, Iran will have to change.
The resolution of karma (individual, group, national karma), will accelerate. This may mean natural disasters (earthquakes, storms, floods etc) or even man-made ones for areas which need to be cleansed of their bad karma (like Israel,Pakistan,USA,China etc).
Even in your personal life, if you have been getting away with murder (figuratively speaking of course), that will probably end presently. Expect any free rides or any situations where you have been able to take advantage of others (or you have been taken advantage of), to end soon.
A major effect will be a stark division amongst all people - those who accept and respond positively to the Christ's message of love and brotherhood and those who reject and rebel against it. There will be no place for any middle ground. This is the result of the so-called Sword of Cleavage. People and nations will essentially be divided sharply into groups of two types (goats and sheep, Matthew 25:32-33):
Those who believe in unity, brotherhood and sharing amongst people and nations regardless of ethnicity, religion or nationality
Those who prefer division, exclusivity, non-cooperation, selfish agendas (with views like - I like my healthcare and I don't care that you don't have any OR immigrants should go back where they came from OR my values/beliefs are better than yours OR we are so morally superior and righteous that we can invade your country and replace the government).
This stark division in humanity is exemplified by two groups that have emerged in the US - the Tea Party organization and Occupy Wallstreet movement. Both groups are angry about the injustice in the world and the powerlessness we all feel while trying to change it. However, each group reacts to this anger in a different way. One group is exclusive - it targets, scapegoats the weak, the disadvantaged and vulnerable elements in society (immigrants, the poor, the unemployed) at the same time rejecting government regulation and restriction of the rich and powerful. The second group is inclusive and defends the weak, the poor and vulnerable and seeks to rein in the power and wealth of the rich and powerful. The first group is almost purely selfish and even racist. The second is even ready to include the first group in its deliberations and activities. The first group has its counterparts around the world, but not with exactly the same objectives. The second group has given rise to similar movements all around the world. There should of course be no doubt about which side the Masters (or the 'Gods') are on.
Note that the consequences above are the natural result of the Christ's presence in the world. They are a result of the energy of Love that emanates from Him - not actually caused by some specific act of will or power on His part.
The initial television appearances in the U.S. have been followed by TV interviews in Mexico, Brazil and Russia. Soon there will be appearances in Japan, Europe and elsewhere. Within a year or at most two years, the Christ/Maitreya will be well known and accepted by a majority of the people of the world. Soon after that the Christ will be joined by Jesus.
Update 2/8/2011: An ethereal figure in white riding a white horse through the crowds gathered in Tahrir Square in Cairo, Egypt, has been seen by many and even captured on video : http://www.youtube.com/watch?v=N6h2-kf8Itg . Benjamin Creme confirms that the Rider on the White Horse was Maitreya, the Christ giving a blessing in order to show the immensity of what the Egyptian people are doing, and that he is with them in their struggle for justice and freedom.
Download the video here. Maitreya has assured us that ultimately 'People Power' will triumph over despotic governments or a powerful military-industrial complex
Update 10/6/2012: A miracle girl in Kabul has words from the Koran appear on her face and hands - http://www.youtube.com/watch?v=UJW-WcTAqaw. According to Creme this is a sign from the Christ/Maitreya that he will appear openly soon.
Possible reactions of the world's religions to the Coming of the Christ:
Christianity - Christians will have great difficulty in accepting Maitreya. They are all waiting for the return of Jesus, not some other Son-of-God, even worse, a Muslim. This will make it very difficult for most Christians to accept him as a Messiah. The fact that Jesus will be junior in status to Maitreya will be intolerable to them. However, I have high hopes for the new Pope - he is a very open-minded as well as genuinely spiritual. I am sure he will recognize the Christ for what he is - a new Avatar for the Age of Aquarius. (The previous Pope, the one who resigned, would have been a disaster. He would have refused to recognize the Christ. In fact, Ratzinger had been made aware of this story many years ago while he was a Cardinal and just ignored it.) However, even if the current Pope acknowledges the authenticity of the Christ as an Avatar sent by God, many of his bishops will refuse to go along, since it is a Catholic dogma that Jesus is the one and only begotten Son of God. There will be a great schism in the Catholic Church - it will in fact split into two - those who accept Maitreya as the Christ and those who continue to wait for the 'real' Christ.
Islam - It would seem that it should be easy for Muslims to accept Maitreya since he will come as a Muslim. But that will not be so. Muslims are even more rigid in their beliefs than Christians. They expect the Imam Mahdi to be an Arab and a descendant of Muhammad. Maitreya will not come as an Arab, but as a Pakistani. Some may say that he could be a Sayyid (a distant descendant) and accept him. The real problem will be that the Maitreya will not promote or favor Islam over other religions. In fact he may not even talk very much about religions or may suggest that everyone just follow the one they were born with. This will not be tolerated by most Muslims - so again there will a major schism - those who accept the Imam Mahdi and those Muslims who do not.
Update 12/28/2016: Recently, I have come across an Arabic site that seems to be aware of this story: http://en.ahmedalhassan.wiki/. There are several errors on the website, but the overall message is sound and truthful. It is recommended reading for all muslims. As the site implies, many of the contemporaries of both Muhammad and Jesus will be reborn in this period in order to aid the Mahdi/Maitreya in his mission.
Update 11/21/2017: A recent video upload by the same group above maybe of interest and perhaps quite significant: 'Coming Soon - A Live Speech from Imam Mahdi'
Judaism - The fact that Maitreya will come as a Muslim will be even more difficult for Jews than for Christians. Many of them will reject the Messiah a second time around. Secular or liberal Jews may be the only ones to accept him.
Hinduism - Hindus will have great difficulty accepting a Muslim as an Avatar. But they have been through this before. Shirdi Sai Baba appeared in India as a Muslim in the nineteenth century. Eventually he was accepted by millions of Hindus as an Avatar (although most of them waited till he had died). Hopefully they will not wait that long this time. However, there will still be a large number of Hindus who refuse to accept a Muslim Avatar.
Buddhism - They will have the same difficulty as Hindus. However, if the Dalai Lama accepts him as a Bodhisattva, the acceptance by all Buddhists should be fairly rapid.
Bahais, Ahmadis - The problem for these two groups is that they believe that the Imam Mahdi has already come and gone. That he was the leader of their own sects. I don't really understand why these two groups believe that their respective leaders who have had a relatively small impact on the world, is the Avatar of the Age. It will take some time for these groups to accept that the basis of their religious beliefs needs to be changed so radically.
Atheists/Skeptics - The coming of the Avatar will be a devastating blow to these people. They are as invested in their non-belief as any fundamentalist Christian or Muslim is in his belief. The fact that someone is intellectually superior to themselves or their species is anathema to them. They will not give up their beliefs (or non-belief) easily. They will claim that it is all a trick and a lie. They will say that the voice of Maitreya they heard in their heads was merely some kind of illusion or even a high frequency electronic signal. They will claim that all believers who heard it were subject to mass hysteria and all the miraculous healings were just a placebo effect. Some of them may literally go crazy because of this severe blow to their belief system.