It is a simple truth really: god is god. God is not what we believe of god. God is not our theology or our doctrines. Since the dawn of time humans have had various ideas, religions, doctrines, theologies about god. God has remained god all that time. I will not say that god is unchanging, because I believe that god is love and love is a relational term, any living relation involves anyone involved in the relation changing in response to the other. So have we changed in response to the divine source, so has the divine source changed in response to our devotion, love and creativity. But having said that, our theologies and doctrines do not change the nature or the will of the divine.
Augustine said: If you have understood it, then it is not god. Anselm described god as always being more, greater, deeper than anything that we can imagine. Scripture supports this and shrouds the divine into mystery making sure that we can never nail down god (the popular joke is that we tried to nail god to a cross and he walked away). Faith and what the author of John calls eternal life (aionos zoe) cannot be grasped with the mind or the intellect. Forever it eludes even our most creative attempts.
No matter how much we would like to have god in a box, so that we could explain the divine, so that we can master the ultimate reality and explain the metaphysical in scientific terms, Jesus simply asks us to believe and follow. To believe is not as many people think to have a set of propositional statements that you hold true, rather believing is the act of trusting, loving in the absence of hard proof. You simply cannot believe with only your mind, you must be/love with your heart and your spool and your strength (body?) and your mind.
It is not up to me to tell you how it is, but I take this time to try to point at how it isn’t. The finger pointing to the moon must not be mistaken for the moon. In the same manner our theology, our doctrine, our tradition, our religion must not be confused with the divine. The divine is love, the divine is free the divine is not, in the words of C.S. Lewis, a tame lion.