There is an intrinsic and natural inclination for humans to worship something greater than self. This has been present in man for as long as we have a history of man, and it persists today as much as any time in history, in spite of 'enlightenment' or new age philosophy. The word "supernatural" is created by man to describe something that is not of the natural world. The entity or force commonly referred to as "God" would qualify as a "supernatural" entity. Yes, a "supernatural" entity would defy all understanding of natural phenomenon, otherwise it would not be supernatural. Therefore, it is understandable how people can justify doubt in the 'existence' of God. Things 'exist' in the natural world, 'existence' is manifest in the physical state of being. The supernatural is much different, it is present, but it does not 'exist' in the natural world, it has no physical characteristics, it can't be defined by physical values found in the natural world.
Because "God" can't be defined by physical or natural characteristics, people will often have difficulty accepting it can 'exist' because, from a physical perspective, it can't. If you can only comprehend the physical nature of our universe, you can't comprehend God. This is precisely why belief in any God requires faith. Now "faith" gets a bum rap, it is often said to be "weakness" or man taking an easy way out... but virtually everything anyone ever believes in, requires faith, even principles of physics. You have faith that gravity will work as predicted, that chemicals will react and respond as predicted, that formulas which have been tried, can be repeated with like results, and this all requires you to have faith in the principles of the universe as we understand them. So we all have faith in something, it is required in anything we trust. In order to comprehend the spiritual or supernatural world, you must first have faith that one exists.
Now, I can tell you first hand, that such a world does exist. I just can't give you physical proof. If I asked you, do you love your Mother, I suppose you would probably say, yes... but if I demand you prove to me that you love your mother, can you do that? Not really. You know that you love your mother, there is no doubt or question in your mind, but you can't prove to me that you do, there is nothing you can ever say or do to convince me, unless I choose to believe you. In order to do that, I have to have faith.
I think my understanding of "God" is quite different than most. I know for a fact, there is a positive energy flow, coursing through the universe, which ultimately gives everything we know as life, the miraculous beauty and remarkable nature. This energy flow is constant, it is omnipotent and omnipresent, and those who have discovered the ability to tap into this energy, are capable of unbelievable accomplishment and achievement, as well as knowledge and understanding. It is truly an amazing thing, but you have to know how to realize it. I have personally felt and experienced it, so I believe because I know it is real... and to me, that IS God. And it works in much the same way as Karma, in fact, I think the whole concept of Karma is directly related to human interaction with this energy of the supernatural.
Religion, and religious beliefs, are manifestations of humans trying to understand something not of their world. I believe there are several dimensions, maybe dozens, maybe even hundreds, and we simply 'exist' in one of them. People often ask me about 'afterlife' and I would be curious to know if you believe it is possible as well, but I certainly don't rule out the possibility. I am fascinated by human religious beliefs, because it is interesting to see how people define God, what parameters they establish and boundaries they draw. I believe in something without boundaries or parameters, something too extraordinary for us to even comprehend in our rather modest intelligence. It also fascinates me how many people profess to be Nihilists or Atheists, or even Agnostic, and never realize how they have closed their minds to possibilities, and denied themselves an enlightenment they can never realize, all the while, professing to be wiser than everyone else.
Of all knowledge of all things in the entire universe, what percentage do you think we may comprehend? I believe the number is embarrassingly low. I think there is FAR more that we don't know, understand, or even comprehend, about the universe itself, just in the dimension we occupy, much less other possible dimensions. I laugh at people who proclaim there is no God... As if you know all there is to know.