Please present positive arguments why you think atheism is true

[Phil]

has it been proven, naturalism to be true ?

Nope. It's just the version of reality with the fewest made-up entities. The 'rational' in rational skepticism means that skepticism isn't taken to useless extremes, such as denying reality. If you accept reality as a brute fact, there is at least naturalism. Convincing evidence that there is more to reality than naturalism is needed for believing that more than naturalism is reasonably justified.

This seems apropo here.