So all of the world's scientists - including NASA - all collaborated together on a vast, convoluted conspiracy theory, jeopardizing their carriers and reputations, just for ****s in giggles?
Evolution deniers, vaccine deniers, climate change deniers, spherical earth deniers, etc. are all cut from the same cloth of willful ignorance and intellectual dishonesty. They're more often than not scriptural literalists, where maintaining their beliefs requires them to forgo critical thinking. But as an atheist what's your excuse?