God is the ultimate powerful force. Being ultimate in all qualities he is also extremely humble .... In his great humbleness he hid himself in his own creation... If you want to know God you have to surrender your ego and politely ask him to show himself and I am sure he will reveal himself to you... Very few one in 10 million are privileged enough to lead a saintly life and experience God... As a way to reach that state you could start association with people who are extremely humble, kind , contented and are always willing to help... Such association will help you get rid of your ego and you will progress in your spiritual life...
You cant hon, God gave us free will for each of us to choose him or not, he knows our hearts, every believer and NON believer and sadly people are lacking the faith to know and fathom something they cannot see.
Where is there? The Bible says to "always be ready to give an account for the hope within." To me, this means you can always talk about what God is doing in your life. That's the best evidence you can give, and the one that is least objectionable.
You can't prove that he is there, because he ISN'T. It is all up to your thoughts of life, and your faith in a higher power. I personally am Agnostic, which basically means that I don't believe in god and religion, but I'm not against it either, so nothing you would say, would make me believe that he exists, and this is all in lack of Evidence of his existence. If there was to be real evidence, then i would believe.