Hi A. A.
In my experience, after 20 odd years of searching for the real truth, I've found that the deeper you dig, the more crumbled the foundations of belief get.
You are talking about doctrines based on a book that has contradictions, errors and biases. Clever church leaders have used it to control people throughout the entire modern era.
Doctrines of all churches are based on speculation, faith and interpretation. Jesus himself, who is God to some people, did not even state what the official canon of the bible should be, and neither did any of his apostles.
Any discussion of doctrine is based on an assumption that the core structure is accurate.
When it comes to the bible, that assumption is based on faith, which is not the same as truth.