You’re assuming people must hold beliefs based on rational evidence when religions aren’t based on rationality. Thus your argument is inherently flawed. An atheist with atheist parents hardly needs to deeply consider the matter.

Not believing in a God(s) is no different than not believing in perfectly square pigs. It’s people that have a specific religious belief that put much importance on the subject.

PS: Saying the universe or your life has no purpose is hardly a cause do nothing any more than it’s a cause to build churches.