There Cannot Be Any Being Who Is God
What we have, then, is a conflict between the role of a worshiper, which by its very nature commits one to total subservience to God, and the role of moral agent, which necessarily involves autonomous decision-making. The point is that the role of worshiper takes precedence over every other role which the worshiper has -- when there is any conflict, the worshiper's commitment to God has priority over any other commitments which he might have. But the first commitment of a moral agent is to do what in his own heart he thinks right. Thus the following argument might be constructed: (a) If any being is God, he must be a fitting object of worship. (b) No being could possibly be a fitting object of worship, since worship requires the abandonment of one's role as an autonomous moral agent. (c) Therefore, there cannot be any being who is God. --James Rachels, "God and Human Attitudes"