You'd think that an omniscient, omnipresent, omnipotent, and/or omnibenevolent being would leave some evident trace, given all this omni'ness.
Yet God, whether considered from an impersonal Eastern perspective or a personal Western viewpoint, has left no demonstrable signs of his/her/it's existence.
A theologian would answer, "It isn't possible to know the mind of God, or comprehend the essence of divinity." Well, OK.
But if this is the case, let's do away with religions, mystic paths, spiritual philosophies, and the like, and simply admit that if God is real, this is a mysterious ultimate reality never to be known.
Since true believers won't go for this, I won't accept no answer to Why? Yet I haven't come across a convincing one in my sixty-one years.
The India-based meditation system I belonged to for a long time, Radha Soami Satsang Beas, taught that the ruler of the lower realms of creation, including the physical universe ("Kal") got his job by standing on one leg for countless eons, demonstrating to
God ("Akal") that he had the right stuff to be a ruler.
Part of the deal with God involved a promise from the Big Guy Upstairs that god-realized gurus couldn't perform miracles to attract disciples who, after being initiated, would be able to learn how to leave Kal's domain and return to God, thereby depleting Kal of some souls.
(Yeah, I know it sounds crazy. I never bought into this particular bit of theology, though. Plus, it really isn't any crazier than the notion that God sent his only Son to die on the cross and absolve the sins of humanity.)
Other religions come up with equally unbelievable explanations for why God hasn't left any supernatural traces in the natural world, don't even attempt an answer to the "Why no trace?" question, or consider that God did leave evidence of a divine presence in the past, as related in scripture.
Carl Sagan addresses this issue in his book, "The Varieties of Scientific Experience."
You have to ask, "What is the evidence?" And it's insufficient to say, "Well, there is this extremely charismatic person who said that he had a conversion experience." Not enough.
There are lots of charismatic people who have all sorts of mutually exclusive conversion experiences. They can't all be right. Some of them have to be wrong. Many of them have to be wrong. It's even possible that all of them are wrong. We cannot depend entirely on what people say. We have to look at what the evidence is.
And that's lacking. Sagan notes that people will say, "God is love, and I feel this love, so I know God exists."
Well, atheists feel love also. So do adherents of every religion, many of which have extremely different conceptions of God -- Hindus vs. Christians, for example.
Sagan wonders, as have I, why God hasn't left some indisputable sign of divinity lying around the creation for us to marvel at. Why no giant cross orbiting the Earth? Or an immense Islamic crescent on the moon if Allah is the real deal?
Then there's the puzzling reality that none of the supposed prophets of God or God-realized sages have told humanity any hitherto unknown fact about the physical universe.
If these people are in touch with a supernatural consciousness, why don't they know something no one else does? Carl Sagan says:
Imagine that there is a set of holy books in all cultures in which there are a few enigmatic phrases that God of the gods tell our ancestors are to be passed on to the future with no change.
Very important to get it exactly right. Now, so far that's not very different from the actual circumstances of alleged holy books. But suppose that the phrases in question were phrases that we would recognize today that could not have been recognized then.
The Sun is a star. Now, nobody knew that, let's say, in the sixth century B.C., when the Jews were in the Babylonian exile and picked up the Babylonian cosmology from the principal astronomers of the time. Ancient Babylonian science is the cosmology that is still enshrined in the book of Genesis.
Suppose instead the story was "Don't forget, the Sun is a star." Or "Don't forget, Mars is a rusty place with volcanoes. Mars, you know, that red star. That's a world. It has volcanoes, it's rusty, there are clouds, there used to be rivers. There aren't anymore. You'll understand this later. Trust me. Right now, don't forget."
This never happened, though. Sages, prophets, mystics, gurus -- all of them have known no more about the universe than the scientists of their time (and usually a lot less).
Thus God not only doesn't leave traces of divinity in the physical creation, God also doesn't leave any demonstrable evidence of divine knowledge in the minds of those who supposedly have come in contact with him/her/it.