Why not? The two things I have mentioned do not have any evidence for existing.
Well, for one thing, they're made up. We KNOW they're made up (which is, admittedly, what makes them effective). We don't know that about God. You can make up all the unfalsifiable counter-examples you want, none of them will ever be adequate, because none of them are writ into human nature.
Real or not, God is a part of what it means to be human. There has never been an atheist civilization. The more we learn about neurology, the more it seems we're hard-wired for God-belief. It's part of what we are. It takes something powerful to reject that, as atheists do.
FTR, I'm not saying that atheists are less human, or any of that retarded nonsense. Indeed, I admire the vast majority of atheists for having the courage of their convictions.