 Dawkins, Kraus, Peasey Myers and other well-known leading atheists believe the scientific impossibility that nothing created everything. Not that nothing was in the beginning. They believe nothing was the prime mover. Is that why you believe? No. So what do you believe created everything? I don't have an answer for what or if anything was created. I have no problem with the notion that the universe existed forever in some form. But this has nothing to do with atheism. That's not the definition of atheism. That's not the usage of atheism. Atheism doesn't tell you anything about what someone believes about the origin of the universe. Atheism addresses what someone does or does not believe about a God.