I'm trying to put into words the core principles of accessible Christian theology.

Not mentally or intellectually accessible, but feeling-accessible -- heart-accessible -- and therefore actually and experientially accessible!

Karl Barth promulgated what was called a "theology from the top down". He saw himself as opposing theologies "from the bottom up". But it was a false dichotomy. We start from where we are -- and in base-level terms, where our hearts live (and die, sometimes daily); and then we are in a position to listen to Hope that travels from the top down. Theology, in other words, is neither from the top down (solely), i.e., entirely vertical; nor is it from the bottom up (solely), i.e., entirely horizontal. Christian theology is Up the Down Staircase!

Oh, and I hope you like ABBA. "SOS" is one of the great songs of the Glacial Age. Not to mention Ash's track at the end of the cast, which is moving straight from the top end.