The difference is: you are referring to events IN THE BIBLE where the individuals have claimed to be doing what they have done in the name of god. Your good book is claiming this, not an outside source. So, are they lying? Did they just claim to do what they did in the name of god, when it was really for there own good? If so, why are there liars in the bible? Why base your entire religion off a group of raping, pillaging, murdering liars?
You say that men only "claimed" the name of god for the crusades, I guess that is material enough for the bible, yes?