Building upon the previously-established concept, it becomes necessary to infer the identity of the Divine. This is the so called "right God, wrong God" argument. The problem with such a task is that it is, in its own way, inherently subjective. We would need to identify with the Gods of all the various Holy Texts, and then make a study of the nature of the universe itself, and in so doing, come to find that there is no one disqualifying factor, and the name of God becomes a matter of personal faith.
And there is absolutely nothing wrong with that. It's faith predicated on reason, and so long as "which God is God?" is approached in a calm and rational manner, it's also faith built of reason. It has been made a common atheistic argument that we are to pay no attention to the man behind the curtain. While I respect anyone who can come to philosophy with a Wizard of Oz reference (or any reference that's not in a Holy Text), there's a certain fatalism contained in the argument. The human mind can't rationalize God, fully knowing Him, so why try to know Him at all.
Philosophy, for all its ontology, logic, and reason, is still a highly subjective field. Even with all the proper proofs in place, a given reader, either not understanding or otherwise, can reject the thesis. Sometimes, such a rejection is subject only to the beliefs of the reader. Others, it is a result of a flaw in the text.
Coming to know God is a hard, personal journey, and even once you're sure "which" God you mean, you run into problems. Suppose you settled on the God of Abraham, the God who heads the faiths of Judaism, Christianity, and Islam. Okay... so do you wish to become a Jew, a Christian, or a Muslim? Suppose you decide to become a Christian, either out of convenience or a spiritual tug? Protestant, or Catholic? Catholic... Roman Rite or Eastern Rite?
You come to see the point. The idea of it being difficult to understand and grasp God is nothing new. It's so old, in fact, that cultures inherently alien to one another have sprung up, shaped largely by their faiths over the annals of human history.
It's all a matter of vocation... which is a subject for another article.