@DeathDonut
the crusades, despite the religious connotations with them, were more a joint reaction to the centre long incursion of the muslim world, religion is a fairly useful banner to get people behind when people otherwise would have no reason to care.
as for what wiki says about religion, no clue, I specifically talk about monotheistic with an afterlife concept because so far everyone I encountered has that built in mechanism of 'oh, they are enjoying life and getting wealthy off your work, well, they will suffer AFTER this life is over, so just deal with it' kind of text. as for christianity itself, don't look at the reformation, I mean one of the commandments is 'thou shalt have no false idol' or whatever and most punishments do call for the death of those that do, the reformation has given christians some level of chill to things that go against their religion, that I will credit them for, but it also wasn't by choice they did that. if I remember correctly, there are quite a few calls for the death of people who question authority from childhood to adulthood. when you take the religion out of what they say and imagine a group of powerful people creating a religion to control the masses, it makes far FAR more sense.