When people claim religion is harmless.

[John V]

And anti-religious people don't want to look at the good side of religion. They filter the positive and delude themselves.

Considering the ubiquity of religion in human cultures, it seems obvious that religion generally results in a net good for society.

That does not follow.  A behavior that is popular is not necessarily positive.

Depends on whether you subscribe to natural selection at the group level. If you do, then my conclusion follows.