What do the theists, those who believe in a God, and only one God, hold true that non-thiests do not? What is it that those groups do not hold as true.
I don’t believe there is existence beyond this existence. There isn’t anything after this. Certainly not just because there was something before me. That isn’t a proof, not even alert evidence of my continuation beyond “here.”

This is what is. If we desire a perfect life, if we wish an ideal world, if you want a full life, it must be here. Thinking that it is somewhere-when else means y/our work will wait for God. It will wait for eternity.