Because most Christians are severely prejudiced against atheists, and consider pretty much anything we do or say to be offensive. Most atheists learn early on that there simply is no pleasing them, which is why some take sport in being purposefully offensive just to watch the veins on your forehead throb, since they know you're just going to get offended no matter what we say. I have actually noticed more downvotes, blocks, and reported answers for explaining scientific facts in a civil manner than I have for making posts like "lol you're dumb.
Not meddling if the atheist shows some respect. But that happens very rarely in here.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.