I have two reasons for why God exists!
1. We all have a sense of a greater power.
We all have a sense that someone greater is out there. That Someone is God, otherwise known as Jehovah or Yahweh.
2. Even evolution supports God.
You know how people say "this fossil shows evidence of evolution!" But, some fossils are buried in several layers of the earth. This shows evidence of a Flood-- the great worldwide Flood caused by the Creator. Also, people say that animals evolve from certain other animals. For example, how could the bat have survived whilst he was evolving from the creature similar to the tree shrew?
Add your own and I will choose and write your evidence that God is real down below.