"Do atheists really think that everyone who claims they converted from atheism to theism
based on an experience is either deluded or dishonest?"
Technically, yes. Given my world view.
Or that I'm deluded. Given my world view.
Since I don't, can't, completely rule out the second line, I'm in no position to get dogmatic or superior over the first line.
It's something still open enough for discussion, at least with a theist who thinks my position is deluded or dishonest but is not dogmatically superior about it.
No a priori certainties, just starting from where I've arrived.
Oliver Cromwell, in a letter to the general assembly of the Church of Scotland:
"I beseech you, in the bowels of Christ, think it possible you may be mistaken."
History does not record whether he had the rare gift of being able to take his own advice.
Hoping for "... and I'll do the same" here, from Oliver, is probably being a bit optimistic.