Forgive my ignorance, but I've got many questions that make it somewhat impossible for me to believe in the Abrahamic god.
One of the major things is about how the concept of God developed out of an earlier Hebrew god, how do for lack of a better word "Abrahamics" deal with this idea proposed by historians?
I can't speak for "Abrahamics," because in Judaism, we concern ourselves only with Judaism. Other religions that claim the mantle of Abraham have nothing to do with us-- not that we don't wish them well, they just have no connection to Judaism.
For us, theology is intertwined with our understanding of Torah: we believe that the Written Torah is impossible to understand without the Oral Torah, which is an evolving interpretive tradition, the roots of which we believe were given along with the Written Torah-- which, in turn, we believe was designed to be infinitely interpretable, with limitless layers and levels of meaning.
Therefore, we see our theology as an evolving process of thought, ever refining and sharpening our understandings of God and what He wishes from us as the ages pass, as we grow and evolve in comprehension, and reinterpret and re-examine the text as we do so.
So if our earliest ancestors were monolatrous or henotheistic, followed by rudimentary monotheistic worship of YHVH, followed by ever more nuanced and complex understandings of YHVH and worship of Him, to us, that represents nothing but what we expect from a revelatory tradition designed to evolve and grow and deepen over our history.
As for your "impossibility" of believing in "the Abrahamic God" (whatever that might mean): fortunately, Judaism is also a non-proselytizing religion, and non-universalist: we have no interest in recruiting non-Jews to become Jewish, and we presume that non-Jews are perfectly able to have spiritually nourishing relationships with God, and do what pleases Him on their own, according to their own traditions and teachings. So from our point of view, as long as you are a moral person who tries to help make a just society, we don't care if your conception of God resembles ours in any way, and we presume that God doesn't care, either.