God is a metaphor for the reality of the natural world. If you want to know God, just look at nature, look at the universe.
The more we learn about how the natural world works, the more we know about God. God could not exist in an unnatural world. What is unnatural does not exist; the "supernatural" is a concept that only exists within the human mind, the same mind that creates great work of fiction. The natural world is the truth, it is reality. If a heaven, hell, karma, or nirvana exist, than it is a natural state of existence that is real.
All life in our universe is made of the same debris that that the universe is made of, we are one and the same. You can look at life on just the earth the same way. All life is created from the same material that makes the earth. When left to natural cycles, life dies and returns its material to the earth. This material could someday become another life, in another form. In this way, we are eternal.
The hard part is accepting reality. The mind does not always see reality clearly. Reality can be obscured by the human mind's delusions - an optical illusion of consciousness. We think something is real and part of the natural world, and therefore it becomes our reality, but it may not be true reality. We stay in this delusion until we wake up, or until reality ends for us. We suffer with the delusions of our limited human minds, when there is much more to reality than our human minds can comprehend.
Religion is a problem because it tries to define what God is by using the limited words and ideas of the human mind. We know something exists. When we try to define God using human language, we lose its meaning or change it into something that is unnatural. Not everything in reality can be put into the limited languages of humans. Instead, religion tries to be above the natural world, more powerful than reality. Humans suffer because religion has become more important than happiness. Blind religious faith blocks the mind's natural curiosity about reality. The bibles of religion have many good concepts. But it is how we interpret these concepts that lead to problems. You see this is where we try to conceptualize ideas which just don’t translate into human language. We lose something in the translations and this is very dangerous.
Even if religion could accept reality and the Power of Nature as God, the religions would argue and kill over what is real. Could science ever become the judge of what is God? When will the human race search for God by searching for knowledge of what is real, instead of spreading dangerous religious fundamentalism that is an unnatural, anti-human, and fallacious ideology that destroys God?
"A human being is a part of a whole, called by us 'universe', a part limited in time and space. He experiences himself, his thoughts and feelings as something separated from the rest... a kind of optical delusion of his consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us. Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty." - Albert Einstein