There is neither tangible evidence nor logical proof for Gods existence. If there should be a cause for an effect, there should be a cause for God. Otherwise He becomes a causeless effect.
People simply take for granted His existence due to childhood indoctrination or programming from parents. They believe in the god of their parents. One born as a Muslim continues to live as a Muslim, a Christian as a Christian and so on. But the gods of these religions are totally different. Jews believe in Yahweh, Christians believe in God the Father, God the Son and God the Holy Spirit. Islam’s God is Allah. Orthodox Hindus believe everything is the Absolute Brahma and there is no separate god. Ordinary Hindus believe in so many anthropomorphic and nature gods. Belief of the vast majority is not a proof for the existence of God.
Yes, God cannot be proven by scientific reasoning at all. We study and understand our universe or natural world through science only. So far no scientist has put forward a theory of God. Stephen Hawking, made it clear many times that there cannot be a god. The physicist explains that science now offers more convincing explanations for the existence of the universe and life. Even Einstein is against the concept of an afterlife or God or religions. He speaks: "I cannot imagine a god who rewards and punishes the objects of his creation.... Neither can I believe that the individual survives the death of his body, although feeble souls harbor such thoughts through fear or ridiculous egotism." Since the beginnings of recorded history God’s existence has been continuously questioned and debated.
Forget about proof; is there a comprehensive definition of God? There are many definitions for the same God as there are many gods.
God is considered Eternal, Omnipotent, Omniscient and Omnipresent. I have read about some of the paradoxes of being omnipotent. It is self-refuting and contradictory. Almighty should be able to do everything and he must have every capability. Some abilities negate each other. For instance one cannot be walking and standing or sleeping and keeping awake at the same time. If there is anything beyond his realm of capability He is no more omnipotent.
The Christian God is not able to save people from the eternal hell. The Church says He has given free will to man and His reward or punishment will be based on his actions using his freewill. But the psychotic, mentally retarded and children cannot exercise their freewill. God knows millions of his favorite creation will be roasted in hell but still He creates them. The Catholic Church proclaims that God loves man more than anything else but He cannot save them! At least He can desist from creating them. But He keeps creating. Is he omnipotent in this respect? He could not even avoid creating Judas, the betrayer. God himself says it would have been better had he not been born. Judas was chosen by God with a proactive role in the redemptory process and still He Did not save Him!
The Catholic Church also proclaims that children baptized in the name of the Father, Son and the Holy Spirit will be admitted into heaven. That is not a reward based on their actions. Hence if God can reward children without any merit on their part, why does He not save all people by directing their will in an efficacious way so that they do well and reach heaven? After all He loves them so much!
If the souls of the children, who die unbaptized, are punished into hell, we cannot conceive of a God who is more fiendish than the Christian One. They did not ask God to crate them. They died as per God’s Will and if they get roasted in the raging fire for all times, it is more horrendous than my words can say. If they are saved because of His love for creations, then He can save anyone. The whole redemption-passion and death of His son, Jesus- becomes redundant and unnecessary. If there is no redemption, there is no need for the Bible, Church, Popes, bishops and the priests.
Why doesn’t the Almighty stop natural calamities like earth-quakes, volcanoes, tsunamis, floods, plagues and famines that have wreaked havoc with man? We are told He loves man, His special creation, more than anything else. And in one plague He destroys the dreams of millions and millions and obliterates everything they have built up so laboriously. Is He a loving omnipotent? It does not stand to reason. Ever since man’s appearance here the only reality has been pain. Earlier there was inadequate food: there were wild beasts roaming about everywhere and man’s life was under constant threat. Why does God allow terrible things to happen to His favorite creation? Why has He to kill millions in pestilences and natural-calamities? Why is He allowing innocent children to die of starvation in India, in Bangladesh, in Africa and elsewhere?
Either God is not able or He is unwilling to prevent pain and suffering to his favorite creation. If he is willing and is not able then He is no more God. We have to deny His existence. If He is not willing, then He is a monster. If he is neither able nor willing then, as Epicurus asks, why call him God?
As we write these lines, there are millions of people in hospitals around the world now who are suffering from cancer, AIDS, heart attacks and innumerable other deadly diseases. There are children and grownups dying without food or water. Why is the Almighty not bothered? He is not there; people created Him.