Sorry there's no such thing as proof, you must make your own decision to accept or reject God.
Luke 17:20 (New American Standard Bible) wrote:
Now having been questioned by the Pharisees as to when the kingdom of God was coming, He answered them and said, "The kingdom of God is not coming with signs to be observed;
This comes fairly close to what I believe in, but I do have to bait a little and ask you when you consciously rejected Budhha, Krishna, et al?
Rejection is not always a decision, and neither is faith. To call disbelief in monotheistic religions a rejection of God is kind of a cheapening of faith to me. Most don't make that decision. I doubt that you think you're particularly more thoughtful about belief than most others who inherited their religion. My guess (and I invite correction, as I'm putting words into your mouth), would be that you follow the religion of your parents, and what is socially acceptable in the area where you live.
Acception or rejection seem like the wrong way to look at the issue of faith- it suggests a free market of belief. It's as wrong a way of explaining someone's spiritual character as it is for me to suggest that your beliefs are purely the result of where you were born.