As I get older, I realize that I know less and less about God.
God – a simple three letter word. I can pronounce the word "God" with the same energy and breath as I pronounce the words "cat", "dog" or "mouse." But, that's the heart of the problem. Given our ability to speak of "God" in the same way we speak of any other "thing", we fall into the trap of thinking of God as simply another "thing" or "person." God become a category just like any other category,
And not only do we see this God as simply one other being or thing, we have "supersized" God, emphasized God's "maleness" and for the most part, placed God "outside" and "above" this world.
Given this perceived synonymy of God with all the other stuff of the world, we then feel a need to prove or disprove God's existence, using the same kind of reasoning as we would in proving or disproving the existence of cheese on the moon or the dynamics of climate change.
But such arguments and counter-arguments, while maybe stimulating for the mind, if not for the publisher's or writer's bank account, are generally useless when it comes to actually "proving" or "disproving" God.
As I mentioned at the beginning, I realize that I know less and less about God as the years advance. Furthermore, I seem more and more hesitant to use the word "God" – at least in any glib or assumed manner. Rather, I simply want to remove my shoes, bow my head, and tread very softly. 
When I speak of God, I am not speaking of simply another thing like all the other things of the world. Rather, I am trying to speak of the ground of all things, the source of all things, the goal of all things. In a word, I am attempting to speak of Mystery. Mystery, not as something to be solved, but as an experience to be entered into – with head bowed low.
The Christian tradition has long understood a need for "ground rules" when speaking of God. Three rules of God-language are generally accepted. The first is that when we speak of God we are speaking of mystery. The God of which we speak is so apart and so different from the world – and so close and so intimate to the world that God is mystery, totally incomprehensible.
Despite this incomprehensibility of God, we need to use words to talk of God. God is Father, Transcendent, Immanent, Holy, Truth, Beauty, Good, Love, Merciful, Wisdom, Fire, Wind, … God Is Who Is. But words are limited. And so, our second ground rule states that we always speak of God indirectly. No one image can ever encompass the fullness of God. We need many images of God. But, these images point toward God, but never fully comprehend or encompass God.
These first two rules imply a third, namely that images of God are just that, images, and cannot be taken literally. The literal is too narrow for the infinite, unbounded, everlasting God.
Two important implications spring from these three rules of God-talk. First, our knowledge of God and our knowing God are two different things. The debates about the existence or non-existence of God are abundant ad nauseum. But to know God – that only seems to happen in the deepest, most silent recesses of our heart. We never grasp God. We simply enter into the ineffable mystery of God.
Secondly, the incomprehensibility of God invites us to a profound humility in our utterances. Who really knows the "mind of God"? Scripture plainly stresses the fact that God's ways are not our ways. And Job had to learn the hard way that he knew nothing of God.
The next time you use the word God, be attentive. It may have only three letters – but never in the history of humanity did three simple letters mean so much.