STATING THE PROBLEM
COEXISTENT MUTUALLY EXCLUSIVE CATEGORIES
Almost all the logical problems that we have with "one God yet 3 persons" and a "dual nature" in one person, problems that we cannot explain without resorting to "we can't explain it because it's outside of our human experience" occur because we say that Jesus was God. The main reason that we say that Jesus was God is simply because of the many scriptures that seem to say that Jesus was God. This involves having to resolve the tension between the scriptures that support the Creed of the Jews that God is One, affirmed over and over, affirmed by Jesus himself, yet at the same time we have scriptures that seem to speak of Jesus as God and yet differentiate Jesus from God the Father. We have scriptures that speak of Jesus as if he is a man, and others that speak as if he is God. The "two natures" concept is nowhere explicitly stated, it must be inferred as a solution to these seemingly coexistent mutually exclusive categories. That's the logical problem - coexistent mutually exclusive categories.
If we can legitimately, realistically, and honestly (I repeat: legitimately, realistically, and honestly) determine that we have misunderstood the "Jesus was God" scriptures - if in actual fact the historical Jesus was not God, ALL THESE PROBLEMS GO AWAY.
Below I have used my Greek friend's list of scriptures that seem to say that Jesus was God. Following that is a list that seem to indicate that Jesus was NOT God. There are many more in both categories but this is enough to illustrate the problem.
VERSES THAT SEEM TO SAY THAT JESUS WAS GOD
VERSES THAT SEEM TO SAY JESUS WAS NOT GOD
As a point of argument, if we could determine that we have misunderstood the scriptures that seem to say that Jesus was a man, that is, he only appeared to be human, but really wasn't, we could also resolve the logical conflict. This position does have historical precedent (Docetism) but it lost out to the Trinitarians. It's not relevant to the discussion at hand because Trinitarians acknowledge that Jesus was human. The problems arise when they say he was also God - human and God at the same time - and thus the confusion begins. See: "God" and "Man" are Mutually Exclusive Categories.
My experience has been that when we have seemingly opposing scriptures (e.g. predestination vs. free will), what has happened is that we don't understand at least one set of those scriptures. Our misunderstanding is what creates the conflict. The proper solution to this is not to speculatively infer some kind of extra-Biblical scheme (as in the Trinity and the dual nature of Christ), all that does is REINFORCE THE MISUNDERSTANDING, but to endeavor to come to another hopefully more accurate understanding of one or the other, or both, sets of seemingly conflicted scriptures. Ideally, the improved understanding can be justified from the immediate context, has no logical problems, and has some kind of historical referent. That's the goal. It seems to me that questioning the understanding of the set of scriptures that seem to speak of Jesus' deity is the most logical place to begin in light of the preceding centuries of Jewish monotheistic history - a history and a paradigm that ALL - ALL! - the New Testament writers were steeped in. Not only did Jesus explicitly affirm Israel's monotheistic creed but the Apostle Paul did as well, no one disputes this. Jesus was a Jew, all the NT writers were Jews (except Luke?), coming from and writing in the context of Jewish theology, history, and categories of thought. That is why I'm starting from the theory that we don't understand the "Jesus was God" set of scriptures and trying to verify that theory. It's the simplest, most obvious solution.
So, before I give a non-Trinitarian exposition of the above scriptures, and a few others, I would like to establish the Jewish paradigm, the matrix that both Jesus and the apostles were coming from, and therefore the world-view context, the categories of thought, from which these supposed Trinitarian proof-texts should be understood. While it may be that some of those scriptures seem pretty solid now - I understand how that can be - it has been my experience that what seems solid today might look distinctly like quicksand tomorrow.