Exactly what experiment did Darwin perform to disprove God?

I don't know a single true atheist who claims that science disproves god, and neither do you. Darwin was a Christian who noticed certain traits in various species of animals and recorded them. He then theorized based on his observations. However, what many people don't realize is that he was a racist, and he was trying to prove that non-white were inferior using his theory. As for your argument, it is pointless. I don't have to disprove the existence of the Tooth Fairy. You have to prove he does exist.