I admit to being more a "nature cultist" than a "science cultist"

And the reasons are evidence and logic based, rather than based on feelings.

It comes from the sum of everything I have ever experienced and heard and read about, all with different levels of credibility attached, according to our inner judge.

To this a philosophy is attached, comprising those beliefs or ideas that have greatest explanatory power, given the "facts" accumulated.

This is rationality, our approximation of truth!