Re: The proof that God exists... if one wants to know whether or not God exists, one should do a simple little prayer and ask Him. Ask Him to show without a doubt that He exists. If one REALLY WANTS to know...that's really all one has to do.
A few years ago I read a book called, "A Course in Miracles". It isn't the Bible, but it speaks of God in a way that I have not heard before. What it says is, "Nothing real can be threatened. Nothing unreal exists. Herein lies the peace of God." I agree that knowledge is truth and to have a relationship with God gives us knowledge of the truth of His existence. God is Real.
"A Course in Miracles" makes a fundamental distinction between the real and the unreal; between knowledge and perception. God is love and knowledge is truth. To have a relationship with God is to know the truth; something that cannot be clouded by perceptions.
This book says, "Truth is unalterable, eternal and unambiguous. It can be unrecognized, but it cannot be changed. It applies to everything that God created, and only what He created is real. It is beyond learning because it is beyond time and process. It has no opposite; no beginning and no end. It merely is." "The world of perception," A Course in Miracles says, "is a world of time, of change, of beginnings and endings. It is based on interpretation, not on facts. It is the world of birth and death, founded on the belief in scarcity, loss, separation and death. It is learned rather than given, selective in its perceptual emphases, unstable in its functioning, and inaccurate in its interpretations."
The proof that God exists is found in the thought system of knowledge, rather than the thought system of perception. In the realm of knowledge no thoughts exist apart from God, because God and His Creation share one Will. The world of perception, however, is made by the belief in opposites and separate wills, in perpetual conflict with each other and with God. What perception sees and hears appears to be real because it permits into awareness only what conforms to the wishes of the perceiver. This leads to a world of illusions, a world which needs constant defense precisely because it is not real.