Friendly Atheism

[GrandizerII]

 But I suspect even this will trigger debates about what "sound" means ...

As it should; I disagree with labeling someone's beliefs as irrational based on intuition. It warrants proper criteria and measurements.

Rationality is to do with the use of reason. But solely relying on logic seems to imply that evidence need play no role. And if so, then of course theism can be rational, just not in the sense that we here tend to think of that term. That's why it's better to ask if theism is instead based on sound arguments, which in others words means based on observable evidence as much as valid logic. I would argue it's not, for the most part (unless you're defining theism in a very trivial sense).