Very good question, Does God exists!!
I reply by a story happened to one of the scholars about 1200 years ago who was asked this question by a man next to the river in Baghdad, Iraq? long story but nice read till end..
to answer this question the scholar gave appointment to the man who asked the question at noon of the next day next to the river. The man came at noon but the scholar didn't come until 1 or 2 hours later. when the man asked the scholar about his late arrival, the scholar told him that he was on the other bank of the river and didn't find a ship to bring him, he waited long then suddenly one empty ship ( no one is driving it ) came to the bank, stopped at the bank for him to step in, he went onboard, the ship sailed in the river ( without any control by any one), the ship came to the other bank of the river and stopped there so the scholar could step out of the ship to come to his appointment. The man immediately shouted are you crazy? how can a ship comes without a sailor, stop for you, sail back to here without any controller. Actually the scholar was waiting this answer and told the man if you can't believe that it is impossible for a ship without a sailor can do this, how you would believe that all this universe runs in this accuracy by itself without a controller (GOD)? May be this scholar before 1200 years didn't know small part about of any of us know now about the accuracy of the solar system, Water and rain cycle, the complexity of our bodies, brains, the system in the atom itself. can we imagine all this runs by itself without having a controller called GOD??