Layer upon layer
Brick upon brick
Precept upon precept
Worldviews are established
If there is an errant starting place the rest of the structure will be faulty. The house built on the sand collapses in a storm. The house built upon the rock stands firm come what may. Regardless of the foundation the building will be built even if it is not long supported. Jesus used the analogy of a house upon sand and a house upon the rock. In His parable the house built upon the rock was the person whose foundation is Christ. The house built upon the sand was the person whose faith was in something else that was not a firm foundation of truth.
What I am getting at is that our first principals, our foundational beliefs about life, anchor all that follows even if that anchor is not secure. If the Judeo-Christian God is the foundation of all truth then it logically follows that all truth flows from that reference point. This means, science, history, morality, philosophy etc. all flow from the starting point of Him. He is the bedrock in which all else is supported.
If, instead, there is no god, then all there is is the natural world: the only way we can know it is to trust our own subjective reasoning being certain of nothing including science, history, morality, philosophy etc.
Either way everything hinges on the truth of the existence or non-existence of God. If the Judeo-Christian God is real then it is logical for all knowledge to be aligned with His truth. If He is not real and there is no God than all knowledge would need to bend to that reality. Or rather would be an extension of that reality. However, I think some great bending and distorting of reason and logic is taking place to support the philosophical position of the non-existence of God. Moreover, the foundations of reason and logic collapse when God is removed from the equation.
Jacques Derrida the famous postmodern philosopher writes about how all of language is meaningless signs with no signifiers if God doesn’t exist. He says that we cannot even be certain about lingual communication for we have no anchor for language if there is no God. Ironically he authored quite a few books. In one of his books he laments reason to be the one thing he can’t get around. He knows it should not exist in a world with no God, and yet, he can’t even reason that to be the case without employing reason. Just the same logically he sees that reason is not supported any better than language if there is no God. He said it is a conundrum he couldn’t get around.
In contrast C.S. Lewis wrote in Miracles, “It is thus still an open question whether each man’s reason exists absolutely on its own or whether it is the result of some (rational) cause – in fact, of some other Reason. That other Reason might conceivably be found to depend on a third, and so on; it would not matter how far this process was carried provided you found Reason coming from Reason at each stage. It is only when you are asked to believe in Reason coming from non-Reason that you must cry Halt, for, if you don’t all thought is discredited. It is therefore obvious that sooner or later you must admit a Reason which exists absolutely on its own.”