But some people just won't be good humans no matter what, and those people will always find an excuse to be bad, even if it's nothing more than "Because I felt like it."
I don't think it makes much sense to blame all the world's ills on religion. If all of the evil people in the world were religious and only the religious people were evil, that idea could have some validity. But that's just not how things shake out. I know too many cases of deeply religious people who are/were very good humans, and I could name some very famous and very bad humans who are/were not at all religious.
I think the basic problem is human nature, not religion. All humans are flawed and imperfect, and some are downright bad. Bad humans are gonna human badly whether they're religious or not.
Religion can be a powerful force, for good or for evil, but it's humans who decide how to channel that force and humans who actually DO good things or evil ones with it. Blaming bad things that humans do on religion is a vast oversimplification, imo. I realize that may not be a popular opinion on DU, but that's my view.