I knew the issue of Homosexuality and its listing in the DSM would come up. That was 1973. Should have been 1873, but that has no bearing on whether the "religion is a mental illness" hypothesis is true or not.

First of all, what kind of mental illness are we talking about? Genetically based? Cultish Brainwashing? PTSDs?

And this peculiar mental illness seems to be contagious, making it different than most mental illnesses. Is it a meme? Are there mental illness memes?

What about Quakers, or Unitarians, or Church of Christ people? Are they mentally ill too?

You'd be surprised how many "normal " people are religious. But being irrational is not always enough to demonstrate mental illness.

I mean, all of our ancestors throughout history have been religious, in one form or another. Are we to say that only recent Europeans (specifically, educated Europeans, and typically male) are not mentally ill, but the rest of the world is and has been throughout history, and pre-history?

These superstitious people had irrational beliefs, sure, but mentally ill?

I'm not convinced.