"God" can't be proven in the traditional sense, but It can be realized within as a firsthand mystical experience. That's the whole point of the spiritual path, of meditation, being loving and peaceful, and of striving for Enlightenment. "God" is a level of consciousness, a state of mind beyond physical reality. I've temporarily experienced It full-blown; Infinite Eternal Divine Love (literally God) beyond all description as my true nature. There's also lower level spiritual experiences like synchronicity, miracles, oneness, out of body experiences, near death experiences, etc. Seek and ye shall find.