From a purely rational point of view it's impossible to grasp, it's impossible to find a remotely satisfying answer to that. I've tried to explain life for almost thirty years through thinking, analysis, discussion etc. and I got more questions and doubts than before. Only once you tap into your inner wisdom then you might find a satisfying answer. That's why I'm such a fan meditation. It's through NOT THINKING that you start to get the answer to the questions: Does God exists? and What/who is God? However I like your approach to use this platform for such deep discussions :)