I’m not sure what you mean by “sole source of truth”. But from my point of view (a believer), if God placed us in a material universe and he gave us senses, it’

I’m not sure what you mean by “sole source of truth”. But from my point of view (a believer), if God placed us in a material universe and he gave us senses, it’s not only our right but our obligation to use these senses and learn about our enviroment. Yes I believe he is the source of truth, he poses all the knowledge, but that doesn’t mean I’ll learn to program a computer by reading the Bible or by praying. And about God being unfathomable, well a finite entity is incapable of containing the infinite, that doesn’t mean we are not able to tend to infinite.