The whole proving thing is iffy.  If you believe in something, then your heart will be in it no matter what it is.  I look at God like the wind...you can't see the wind, you can't touch the wind, but you can feel the affects of the wind.  That is how I feel God.  To each his own.  BTW, BUSA, my kids don't believe in santa either.  I told them Santa was a real person, and now he is buried in Germany somewhere pushing daisies.