Why do people think the bible dumb?

Why do atheist and non believers think.the bible is "dumb" "fake" "inaccurate" why would they print millions every year if it was quote "fake" and if you honestly believe in the big bang your STUPID I.mean do you honestly think we came from two rocks smashing together now that sounds Insane to me so if I was to.go outside and hit two rocks together in a couple millions. Of years there will be a solar system..... DOUBT IT!!!