Christians probably have done the most damage to the environment as well, as most American and European countries are mostly christian in one form or another and are the most economically developed countries in the world, not only that they have had a complete disregard for the environment while building a economy, even if people are not religious like before, attitudes to the environment in general need to change

It's an interesting question. One thought is that essentially Jesus' coming was foretold the first time, and he didn't really get that many followers. One would have to wonder if he could do better a second time.

The internet and mass media would help any evidence spread much faster than preaching to small groups of people as one travels.

I think the outcome would be that most religious people would keep their own beliefs or somehow use it to support their own faith. Atheists could be persuaded to believe that the event was taking place but the likely explanation would still be aliens with advanced abilities (possibly including universe creation) rather than a unique Creator of Earth.

Not necessarily, because Muslims also believe that Jesus will return to the Earth. As for the other unrelated religions, I could see them losing a lot of ground/merit.

+1 to everything Badgenome has said so far, but with a slight modification.

The question presupposses an atheist universe. In a theist universe then of course nothing can suppress religion or the innate human spiritual drive for spiriual sustenance.

So, assuming an atheist universe, yes probably organised religion per se would cease to exist and never come back, but the fundamental human need to identify with a group and support a cause would not disapper, so it would manifest in other ways.

Assuming a theist universe it's a idiotic notion to think people can suppress the will of God, so no, not even during the active suppression of religion would religion suffer from antyhing but a temporary slow down. Indeed throughout history every time religion has been actively suppressed it ends up having the opposite effect. All efforts at killing off early Christianity utterly failed. Same with Islam, Judaism, Buddhism, Baha'i etc. It's never worked.

@ Mr Khan: If it didn't happen the way the current day Christians believe it must happen then Jesus 2.0 would be wholly rejected by all of Christendom. Just as Jesus 1.0 was wholly rejected by the established religion of the day (i.e. the Jewish people at the time) because he didn't appear in the manner that establishment Judaism demanded he appear.

I am so glad they don't teach any of that crap at my school, despite the religious belief's of my family as soon as I developed logical thinking I quickly became an athiest, this often leads to stalemate debates with other family members though.

But I will always be a religous fan of the Richmond Tigers :D

Religion is both a gift and a curse to society kind of like Alcohol.
Until the mystery of our how we were created is explained Religion will always exist and until science can explain things that defy the laws of physics e.g supernatural healing's it will continue.

What do you mean, 'do better' the second time?

Gain more followers among current Christendom than he was able to do amongst Roman-era Jewry.

as Mormons exist I think this thread grossly overestimates human beings intelligence...