I have been put a lot of time in this question recently.
The "true believers that i know defend the religion using arguments like the good that it brings (and it really does something good).
But the most eager to defend and impose religion seems to seek only the social status and power that it brings to them.
What are your visions about it?
Do you think this is connected with a culture/place/religion or it is universal?
Do you know true believers that would spread religion even if it does not bring at least some apparent advantage?