I'm going to go out on a limb, here, and guess that English is not your first language. That's all well and good, but you may want to practice a little more with native speakers before producing English-language work.
Now, to your contest: I'm not usre what internet you've been looking at, but here in the poor old backward United States, there's plenty of content for atheists, agnostics, and the entire plethora of religious and spiritual leanings.
For the record, let me point out that hating Christians doesn't make you an atheist; it makes you a bigot. Atheism is a deeply personal decision based on personal choices and soul-searching.
Based on your comic, I think the reason you have trouble finding that sort of humor is because it isn't funny.
_________________Casual Notice--commentary, comics and an appreciation for snappy hats.