My personal opinion is that Christianity, per se, in the Western World is on the way out.
I think the increase in knowledge, the unifying of the world into one whole, the world economy, etc, are all signs of a shift in world consciousness towards greater freedom of thought and tolerance. Perhaps a world belief system will end up as part of this shift, but I think it unlikely that Christianity will be that belief system.
Of course, it is possible I am totally decieved in my thinking.
It is possible we all are, and that the world is shifting towards the greatest, most monstrous control system ever concieved by mind.
History would suggest that mankind will not make the transition to freedom that everyone dreams of, instead, descending into darkness.
These, of course, are polarized positions.
I freely admit there may be limitless possibilities.
Perhaps Antichrist will rule over a dark, controlled world for 7 years, before Christ returns.
Perhaps aliens will arrive to help us make the shift.
Perhaps the aliens will be, in actuality, demons.
Perhaps the "new agers" are right, and before the year 2012, the chosen ones will "ascend" into 5th Dimension. Or 4th dimension. Or 11th.
Frankly, I dont know.