Thanks for writing this Nino.
You bring up this issue of transcendence versus contingence (that finite humans cannot completely know God). Aquinas talks about this a good bit and it led him to the conclusion that there must be such a thing as general revelation.
You bring up special revelation and various sources of moral authority (tradition and scripture being the main two forms of moral authority that have a leaning toward ' special revelation').
In your question on transcendent existence, do you think that general (or natural) revelation is a credible way to understand transcendence? I'd be interested in your thoughts based on your experience with Aquinas.