I'm talking about theism, not theists. Theism isn't generally rationally justified. Whether individual theists are overall rational would require a lot of information that I don't have, so that doesn't interest me.

There are rational forms of theism, such as those that deem religion to be a useful trick for keeping society in line, but these would be self-destructive. Religious faith seems like Dumbo's feather, in that you have to maintain an illusion to keep the magic alive. Once you cross over into rationalizing everything, you become like Dostoevsky's cynical Grand Inquisitor. Religion serves a function, and fulfilling that function may require entertaining preposterous beliefs as shibboleths. Religious people may overlook the anachronisms for a greater good. It's a case of useful-self-deception (Plato called them "noble lies"). And yes, I identify similar self-deception in the secular world, too, as in consumerism, neoliberalism, wokeness, scientism, and so on.

I've written that we should be much more agnostic than we often are about cosmological questions. Still, what you say there about Hawking and creation from nothing is a canard. That was hashed out in the critical responses to Lawrence Krauss's book A Universe from Nothing:

https://en.wikipedia.org/wiki/A_Universe_from_Nothing#Reception