When you get right down to it, "Atheist" is a stupid word. [View all]
We actually have a specific word for people who don't believe in sky wizards, and we really don't need it.
We don't have a specific word for people who don't believe in leprechauns. Or unicorns. Or bigfoot. Or the abominable snowman. Or vampires, werewolves, the Loch Ness Monster, chemtrails, lizard people, ghosts, jackalopes, faeries, elves, goblins, winged serpents, dragons, mermaids, giants, the Jersey Devil, or Trump's integrity. We also get by without specific words for people who don't believe the moon landings were faked. Or that water fluoridation is a government plot. Or that the government is putting mind control chips in us. Or that vaccines cause autism. Or that 9/11 was an inside job. Or any of the things which have just as much basis as mythology.
Actually, we do have a specific word describing people who don't believe in any of these things: "Rational." It works better than "atheist," I think.