The "hate" that comes from Christianity is more a response from challenges to a dogmatically held belief system. It's very similar from trying to have a rational discussion with a raw vegan or a libertarian. I'm generalizing in all cases as there are clearly rational people behind each of the three mentioned systems of belief, but it's all dogmatic and more religious in general than it is the overall premise to any of them.

It's people that make ideas bad, or respond badly, not the ideas themselves. Of course any ideas regarding eliminating entire cultures, raging war, or taking of life en-masse should probably not be acted on regardless of how much sense Thanos made.