I do think that my hypothetical of the Nothing reality is a discussion worth having if you want God to serve as the foundation for these types of things but you seem to be moving on from that in order to discuss reason.
Fair enough, you are not so much interested in an account of logic, rather you seem to be more interested in reason and in knowledge.
Before we go too far let me say that despite the Gettier problems I still believe that defining knowledge as a justified, true belief, is close enough for field work

So when I say knowledge, that is what I mean. You are free to propose a different definition if JTB doesn't suit you.
On my worldview reason is effective because of evolutionary reliabalism. That view proposes that senses that truth track and come to true conclusions about the world around them are a survival advantage. This is why we are really good at noticing a big cliff. If it is the case in reality that there is a cliff, it is a survival advantage to correctly identify this and reason that, having seen other things fall off cliffs, that one should avoid it. Interestingly this also accounts for why we get things wrong in specific ways. For instance, in a 3d simulator at Disneyland there is a real intuition that you are falling forwards and plummeting to the earth in a spaceship. Your rational brain tells you this is not the case but it gets hijacked by your evolutionary danger seeking heuristic. Anyway the point is that we both have these externalist accounts for justifying knowledge . It seems like at this point the presup approach just falls apart and we move on to examining the evidence for the various worldviews.