Theism is literally childish

[Whateverist]

No instances of 'supernatural' phenomenon have ever been documented, except of course those relying on eye witness accounts.

That alone would not make it 'delusional' to believe in supernatural phenomena whether it's ESP, ghosts, alien abductions, NDE's or any other claim for which a skeptic does not accept as having sufficient evidence.

I don't think I ever said it was delusional, did I?

Just because those types of phenomena cannot be easily tested in a laboratory under controlled conditions doesn't mean it is irrational to think they could be real.

I personally think it is a little epistemically sloppy, but I don't claim to know what standard everyone must adhere to in order to be called 'rational'.  It doesn't tempt me in the least.  But to each his own.  I'm willing to trust the rationality of those who do profess to believe in things supernatural in measure with the way I experience them to be.  Whether or not someone harbors such a belief does not automatically make them a loony in my book.

The larger point is that atheists putting theistic beliefs in the same category as a serious mental illness is a mild form of anti-religious bigotry.

On that I would agree.