A lot of people don't believe in the Abrahamic religions but aren't atheist either. New Agers are one group.
Okay. Atheists often make a lot of assumptions — specifically about the underlying properties of the Universe. They take the existing framework as a given. But if you start with nothing, you can’t just assume the Universe will conveniently come with E = mc², gravity, hydrogen, helium, the strong and weak nuclear forces, or the precise conditions needed for star formation.
If the starting point is truly nothing, then where do these laws and constants come from? How do you “get” a Universe in which hydrogen clouds can collapse under gravity and ignite nuclear fusion to form stars? You can’t assume any of these attributes will simply pop into existence without an explanation.