Hell

[OnlyNatural]

I just can't think of any premise I could rationally believe that involves the supernatural (the invisible, unmeasurable, intangible, etc.)...

You already do, as demonstrated by your use of argumentation when discussing me. You believe that human beings have an intellectual obligation to be rational and that there are such things as laws of logic that we must abide by in order to have a rational discourse. Are intellectual obligations or laws of logic visible, measurable, tangible?

I wouldn't say we are 'obligated' to be rational, plenty of people aren't rational and we all have our irrational moments. Maybe intellectual honesty is a better way to put it, that we should strive to be as unbiased as possible, and be open to all the available evidence. Reasoning 'from' God, assuming that God is a given, immediately changes your interpretation of everything else, and you become less open to explanations that exclude God.

The laws of logic may not be visible or tangible, but I would say that they are indeed measurable. But even if they weren't, that doesn't mean that something else that is apparently 'self-evident' (ie. God) automatically exists. And obviously not everyone finds God to be self-evident; the existence of laws of logic can just as easily be accommodated in an atheistic world view.