I'm going to write you a big post but I doubt you'll read it, but here we go.
To understand the concept of God you have to first understand the concept of the universe.
- Both are potentially ageless (
http://phys.org/news/2015-02-big-quantum-equation-universe.html)
I'm actually going to stop at this single fact. The quantum equation is being explored right now to there being a universe that always was. This literally goes against everything we know about time. Before this, everything we knew had a beginning and an end. Except for God. Point being, this comes to justify the existence of something that seems so crazy as to have always been possible.
Furthermore, your point about logic behind a big dude in the sky is only valid if you're looking at the universe from a perspective that you know everything that always is and was. We use science in the world to justify and rationalize what does happen. Ultimately, no one knows that there actually is a force pulling down on the Earth that keeps us all there, because it's never been observed. We can see the effects of gravity, but not gravity itself. We can also see the effects of God, although we can't see God.
Did you know that the accuracy of first party sources are based on how long ago it was vs. how many different recorded copies there are of what happened? Well, that being said, the Bible is the most historically accurate book in the world. While we don't have Jesus walking around on the Earth, we still see signs and miracles. (I can provide examples but I don't want to get off topic)
Back to the science part; science does not disprove God in the way that YOU view it. In the way that smart people view it, it actually adds evidence. (PS: the way the world was created in the Bible is clearly metaphorical. It's not going to go through the defined scientific processes of the creation of the world because no one would understand it) Some people would say that if God created the world and everything in it (including science), then exploring science will help you find God. Have you looked up the stats for the first cells to form? The chances it would ever happen are so slim. Not to mention that the life reproduces before it dies and the life actually makes it anywhere. How would cells stop reproducing asexually and start reproducing sexually? It doesn't make any sense in an evolutionary development because it is not needed in any specific environment. Based on random chance (which is hard to explain whether or not the argument is solid), the chance of a 300-molecule-long-protein to form is 1 in 10^390.
I've jumped around a lot but please ask questions so I can get more of a feel of where you're coming from.