To discard that part of Christianity is I think an impossible endeavour. Whether apologists acknowledge it or not, in those doctrines and that concept lie the root of corruption. No matter the solidity of the reasoning, no matter the declaration of deviance as heresy. The age of revelation is over, there is no room for anything new in the minds of men. At least that is what I have become convinced of. You can therefore only build from the past if you want weight behind the belief. Any substituing ideology must be monotheistic if it is to be monistic (if you want to put it another way, realistic). One Godhead, one God.
You can only discard the deviant sects. In Catholicism and Orthodoxy lie the value in Christianity. If their state can't be fixed or is not acceptable then Christianity is simply not an answer. I don't have alternatives, I have my religion and I think it will serve us well but I don't know whether it is for you; but I'm almost certain that without the support of a movement in clergy, eventually you'll end up with a different facet of the same thing. Yet who will do it? Who will enter the Churches to change them from the inside? Who will assert the fundamentalism, the rigid application of neccessary truth?