Atheism isn't about not believing in what you can't see, but rather being sceptical of what can't be proven scientifically OR just a rejection of religious dogma as an ideology. It's just as easy to poke fun of religious beliefs with simple cartoons, especially as there are so many bizzare sects (remember the belief that dinosaurs didn't really exist and their bones were only placed on earth to make us not believe - yeah, have actually been told that first hand).
The point is, let's not look for excuses to divide when we really need to unite against the true evil of the globalists trying to bring on a technocratic neofeudalism, or worse - neocommunism
He doesn't believe in anything he can't see because he already has a fundamental understanding of the Universe. He probably even knows what's outside the Universe, and what was before time. I don't know those things, so this guy (pictured in the meme) must be God. (Sarcasm)