You don't believe that He exists, but those who do believe God believe He exists and care about what God would have us to do. Also, I assure you that God does exist. It's too bad that you can't see that.
I believe that nobody knows the correct answer to that question.
Who do you believe created the god you believe in?
I believe that God is self existent and has power over the laws of the Universe. I believe that, as the laws of conservation of energy and thermodynamics, matter and energy cannot be created nor destroyed, therefore, it is impossible for matter and energy to exist. I believe that God created the matter and energy from nothing as the Bible states and that my position is much more logical given those facts. So, my question to you is, how do you believe that the matter and energy came into existence considering the scientific laws say that it's impossible for them to even exist in the first place?