Well in the west it is clearly on the decline. Islam is another story. I think that ultimately you are going to have secularism vs Islam in the future and as easy as it is to believe that we are destined to win because we are right and moral, history doesn't always side with the moral or correct people. Christianity will become a quaint relic of the past, it is already barely practiced in the first world (including the United States, which has 20% church attendence) None of that has anything to do with the end of the world though.
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