You mean other than they are two different men with different experiences making different choices at different times and different places under different conditions?
Nothing. To me as I'm thinking about it now, that's a lot of differences.
They are also similarities: both created human beings, that's the same. God is unchanging, the same for both. However, what people tell them God is can be be quite different, and that can, not necessarily always, have a major effect, but it's also part of the different experiences and different choices.
I'm not sure what you're asking for here, other than the old Calvinism, and you know my view on that. If it's something else, you can just post it. Maybe I'll have an aha moment.
The question is waaay more simple than you’re making it out to be. It’s not a trick question. Honestly. It’s a question that was asked of me and I thought it was pretty interesting.
Why does one man believe and the guy next door doesn’t?
Is one man more pious, less stubborn, more intelligent than the other guy?
Certainly all men have different experiences. But that doesn’t explain it. Some men have horrible, painful lives and they are brought to faith. Others slide by with hardly a hair out of place and they can’t be bothered.
Or the other way around.
So what is it? We’re all human. We’re all fallible. What makes one of us believe and another of us rebuff that belief? What is it about these two human beings that is different; that leads us down separate paths?