You ASSUME.
I tested it. I have witnessed this Lord take my confused past, many elements that I never could understood, and weave them together into an increasingly solid whole. EXACTLY what you would expect a God to do. Now what men could come up with a system like that, and not be crowing about how they’ve beaten a Sigmund Freud at his own game?
I don’t assume any more than I assume there is a sun and a moon.
And if that wasn’t enough, then there has been providence in small and great ways that have focused my life in where I am now.
I mean I could in principle keep on multiplying conspiracy theories, but then that would leave me where? In the same muddle you are in now, obsessing over a book that is all down and no up.
We test the Lord like scientists test a chemical. In real life.