I am about to argue that there is within postmodern Christianity an understanding of God that is fundamentally different from Reformed orthodoxy. Thus, we must first review the orthodox Reformed viewpoint. The Westminster Confession of Faith has the most comprehensive statement on this topic that I have found. The following excerpt (6.011 and 6.012, Scripture citations removed, of which there are 31) is long, but bears careful study prior to proceeding.
Of God, and of the Holy Trinity
There is but one only living and true God, who is infinite in being and perfection, a most pure spirit, invisible, without body, parts, or passions, immutable, immense, eternal, incomprehensible, almighty; most wise, most holy, most free, most absolute, working all things according to the counsel of his own immutable and most righteous will, for his own glory; most loving, gracious, merciful, long-suffering, abundant in goodness and truth, forgiving iniquity, transgression, and sin; the rewarder of them that diligently seek him; and withal most just and terrible in his judgments; hating all sin, and who will by no means clear the guilty.
God hath all life, glory, goodness, blessedness, in and of himself; and is alone in and unto himself all-sufficient, not standing in need of any creatures which he hath made, nor deriving any glory from them, but only manifesting his own glory in, by, unto, and upon them: he is the alone fountain of all being, of whom, through whom, and to whom, are all things; and hath most sovereign dominion over them, to do by them, for them, or upon them, whatsoever himself pleaseth. In his sight all things are open and manifest; his knowledge is infinite, infallible, and independent upon the creature; so as nothing is to him contingent or uncertain. He is most holy in all his counsels, in all his works, and in all his commands. To him is due from angels and men, and every other creature, whatsoever worship, service, or obedience he is pleased to require of them.
The God defined above is in no way something with which we can claim the most infinitesimal degree of equality. Yet, I contend that postmodern Christians view God as an entity who is to some degree under their influence, if not their outright control. We see this mindset in the repeated listing of God’s (or Jesus Christ’s) attributes that, though technically and narrowly true, are a highly selective subset of the whole. The included attributes are only those that align with the twenty-first century beliefs that permeate postmodern Western culture.
We see this more clearly in writings like the Presbytery of Long Island’s, in which the nature and purpose of God are based only on their own reflections and imaginings. The implication of their utter disregard for Scripture as an authoritative source is that it is within them that the understanding God is to be found.