It's said the greatest and most profound idea the human mind can ever entertain concerns the possiblility of the existence of a personal God.  How we respond to this affects not only our life down here but will also determine our ultimate destiny.  If we can't resolve the "who" question we cannot possibly solve the "why" "what" and "where" problems of our own existence. 

I believe that all mankind has some idea of a Supreme Being even if they choose not to acknowledge this.  This argument will be and has been challenged but never refuted.  The idea of a Supreme Being can be found among many diff cultures and civilizations although they may differ on the name and nature of this God but the idea remains just the same. 

I just finished reading the life story of Helen Keller written by her and believe she's a classic example of this.  Many know that from the age of two she became deaf, blind, dumb and without smell.   She said later, after being told about God, when she was able to communicate with the outside world with the help of her teacher, "I always knew He was there, but I didn't know his name!" 

There are diff arguments for the existence of God.  There is the cosmological arguement, the ontological argument, the anthropological argument and of course the scriptural arguments for God. 

The cosmological argument says that every effect must have a cause.  We, as Christians, believe the world's cause is, of course, God himself.  I read a story about Sir Isaac Newton recently.  He had a miniature model of the solar system.  A large golden ball representing the sun was at its center and around it revolved smaller spheres, reprsenting the planets.  They were each kept in an orbit relatively the same as in the real solar system. 

A friend of his, an unbeliever, came to visit and their conversation went like this:

Friend:  "My Newton, what an exquisite thing!  Who made it for you?" 

Newton:  "Nobody."

Friend:  "Nobody?"

Newton:  "That's right!  I said nobody!  All of these balls and cogs and belts and gears just happened to come together and wonder of wonders, by chance they began revolving in their set orbits with perfect timing!" 

Of course Newton was referring to the argument "In the Beginning, God Created the heaven and the earth." 

Then there is the ontological argument which says that man has an idea of a Supreme Being.  C.C. Ryrie said "Man has an idea of a Most Perfect Being.  This idea includes the idea of existence, since a being, otherwise perfect, who did not exist would not be as perfect as a perfect being who did exist.  Therefore, since the idea of existence is contained in the idea of the Most Perfect Being, the Most Perfect Being must exist."

The anthropological argument says that the conscience and moral nature of man demands a self-conscious and moral Maker.  Where did our conscience come from?  We have a built in barometer that tells us we ought to do what is right regarding the information we have.  We may have a weak or defiled or seared conscience but it is never absent.  Could the Supreme Being we call God, who created us all, planted this moral sense in us?  I believe this is the only adequate explanation. 

There is, of course, scriptural arguments for God.  God assumes all mankind will know or does know about Him.  We have to be taught otherwise. 

The deepest proof of God's existence is life itself.  Looking at a newborn baby or how nature reacts and accomadates itself in the world around it speaks volumes.  I believe God reveals himself to every soul as God has created man in his own image.