"Theology is the systematic study of the nature of the divine and, more broadly, of religious belief" [1]. The latter part I get, lots of people and groups (and regions) have religious beliefs and differences, so it's definitely worth some effort to figure out (from a sociological or anthropological view) what's going on within and between groups of people.
I also get the ethics and philosophy parts, trying to what it means to be "good" etc. But this study of the divine is pure horses*t - even if it's not all just made up, then by definition it's still unknowable. If it's something that someone has just concocted on a whim and claimed it was dictated to them by the Almighty, then it's at best a 2nd or 3rd hand source and a dubious one at that.
1. Is there a God - this is actually fairly straightforward to argue, simply because we can use analytical philosophy to reason about the unknowable and first causes and so on.
2. Is Jesus God - much tougher to approach for obvious reasons, but can at least be reasoned about if you've gone through step 1.
3. Should I be x sort of Christian - easier to reason about if you accept 1 & 2.
That first step is very approachable if you're already interested in things like logical proofs and higher physics.
And neither logic nor higher physics proves that Christianity has the right idea out of the multitude of human religions and infinitude of possibilities beyond.
You're right about the starting point though. By its very nature it has to start there, but it doesn't assume that the people it'll be arguing with will be in the same place.
Now, on a more abstract and heady level, I would posit that because these techniques do induce real change in our brains, that they may point at a truth outside of ourselves. For instance- when I hear of occult practicioners worshipping demons of greed in order to obtain personal wealth- it makes me think that the idea of "demons" ought mot to be tossed out ebtirely. In a certain sense, theyre real. Worship of these demons amounts to giving oneself over to the spirit of that demon (e.g. greed) now does this mean there is a real flying bat like demon creature - no, but it is a lesson in the nature of these demons within ourselves. We all have inner aspects which are base and immoral, and when we choose to feed them, it is akin to worshiping a deity- i creasing the influence and control it has over your thought processes.
Hope this made sense. I find the intersection of occult practice, jungian psychology, and judeo christion demonology to be a very very rich subject where surprising insights abound.
Sure, then why bother systematizing its study in theology, would it be better to just study English language usage of metaphor?
Really blows your mind when you start to put it all together.
Some of the stuff I found most satisfying was proper modern Christian Apologetics, such as the Handbook of Catholic Apologetics. But the Eastern writing is excellent getting across the scale of the infinite and relating that to people on a personal level.
Plus, a book recommendations is always good :).
Then to pull both together try Christian-Islamic Preambles of Faith - An Exercise in Philosophy of Religion or Kalâm for Our Day Modeled after Thomas Aquinas, Summa Contra Gentiles, Books I-III by Joseph Kenny, OP.
https://www.crvp.org/publications/Series-IIA/IIA-10-Contents...