Here's a little thought experiment I came up with when writing a science fiction story:

Lt's say that the christians got what they always wanted: the entire world was converted to christianity. There were no other philosophies; only the one blaring monotone. Even other christian doctrines would be gone.

Let's go forward a few thousand years. What would christianity be like?

So much of christianity is an attack on other religions. In that future, with that part of the religion removed, what would happen? There would be no need to evangelize. There would be no need to quote the bible, as everyone had it taught to them endlessly.

Now, picture these people, who would at that time be unaware that there was even any other form of thinking. They did not have the intellectual background needed to defend their beliefs, because it wasn't needed.

And then one day they experience something that shows them that what they believed was wrong. How would they react?

I have my own thoughts on this scenario, but I'd really be interested to see what all of you would think. I should add that christianity's goal of winning over the world would be the worst thing that could happen, as far as the philosophy itself would be concerned.