To truly "understand" what God is and why God exists requires non-intellectual realization. Acknowledging that this forum is steeped in the intellectual, I am going to present an intellectualized version of why God exists. It will be fraught with all kinds of errors [due to my own inadequate insights as well as what's lost in translation], but we'll give it a shot... The first mistake made by those who cannot intellectualize the existence of God is the idea that God is not an intellectual thing. He is more of a, "this is what it must be based on what we know [and do not know] at the moment," kind of thing, that is, it's the only thing [in the end] that makes sense. And recall that this is not just a couple of dudes sitting at the end of the bar getting into heavy duty discourse after pounding down a half dozen beers, instead, this narrative has been hashed out over many thousands of years by minds MUCH greater than our own. To distill down to its root, man needs God. God is the only conception that makes sense to an individual facing the prospect that he is alone in the Universe. This reality [that we are alone] is a fate that no man can handle [very well]...so he found [not fabricated] God. God, being God, fills all kinds of voids for man and is therefore omnipresent, omnipotent, and omniscient. He is the answer to all the unanswerable questions because man's intellect does not allow him access to much of what his curiosity implores. So, the choice is yours. Go it alone and face the great unknown [alone]...or find God and know peace in your life because there is something greater than your 'self' that is responsible for the things you just don't have the time or energy for...like figuring out every damn thing and taking care of the Universe! The acceptance of God is not weakness, it is the ultimate in pragmatism. Free up your energy so that you can not only fully realize yourself, but just as important, so you can help others confront and overcome the same intellectual gauntlet you face now [which is doing God's work].