I don’t know if this will help, but I was noticeably better at thinking fairly about uncomfortable hypotheses for a while after some experimentation with psychedelics. That’s actually when I realized I was trans. Maybe if the theists in question are the sort of people who use the right sort of drugs, you might want to try revisiting your discussion when they’ve been artificially made more able to consider frightening propositions.
On the other hand, those few months of being more open-minded were also a few months where I kept finding myself believing supernatural things that didn’t make any sense. And I don’t (as far as I know) have a very strong predisposition toward supernatural beliefs. So you probably shouldn’t encourage your friends to drop more acid than they would without your interference; the nudge toward spiritual delusions might well do more harm than the openmindedness did good.
I don’t know if this will help, but I was noticeably better at thinking fairly about uncomfortable hypotheses for a while after some experimentation with psychedelics. That’s actually when I realized I was trans. Maybe if the theists in question are the sort of people who use the right sort of drugs, you might want to try revisiting your discussion when they’ve been artificially made more able to consider frightening propositions.
On the other hand, those few months of being more open-minded were also a few months where I kept finding myself believing supernatural things that didn’t make any sense. And I don’t (as far as I know) have a very strong predisposition toward supernatural beliefs. So you probably shouldn’t encourage your friends to drop more acid than they would without your interference; the nudge toward spiritual delusions might well do more harm than the openmindedness did good.