rrosskopf
LDS High Priest
I can only answer this question from my own perspective, as a member of the LDS church. I say this as a heads up that we might not be in agreement on what constitutes a God, so there will probably be some inherent loss of communication. Never-the-less, I would like you to consider several aspects of this question.Serious question, why does God not show himself
Abrahamic religions are based on the idea that God does show himself, but only to carefully selected people. Altars were built on the top of hills, and sacrifices burned upon them, so that one could get God's attention. The idea that Jesus taught - that nothing was below God's notice - was probably a novel idea. So there was a very real notion, that God lived in the heavens and looked down upon the earth, and occasionally interfered with human affairs. This wasn't an everywhere-present spirit, but an actual extraterrestrial being.
Another concept which bears mention, is the idea of a messenger or spokesman. Wherever God is from, wherever his throne resides, he is not alone, but surrounded by other beings that serve him. As a physical God, which exists in space and time, he must exercise power through intermediaries. So he sends messengers or spokesman to represent him, someone to act as if they were him, with his authority. Jacob wrestled with an "angel", but later names the place "Peniel" because he saw God face to face. It was no less dumbfounding to the Jews than it would be to modern Christians, that any man could physically wrestle with God. In Jewish tradition, it was not God, but in fact an angel sent from God. As far as we are concerned - it is the same thing. In the book of Revelations, it is an angel who appears to John and calls himself "Alpha and Omega", acting as if he were God himself. We call this the divine investiture of authority.
When God gives that authority to someone on earth, they too can act in his name, speaking for God. In modern society, one man would suffice as his spokesman over the entire world, because we live in a global society. Anciently, prophets might have been called in many lands, and there may even have been occasional overlaps where two or more prophets relayed the same message to the same people.
A prophet can either be given authority to act on his own, or he can be given authority to call others to assist in the work. We call this formal organization a church, and the leader of the church must be a prophet called of God. The church then serves as a vehicle through which God can rule and reign without physically being present.