The entity that is the creator of existence itself. Were there no God, there would be nothing, an empty void full of nothing but sadness and despair. God is the reason you are able to have fun with your friends, feel love for another, have your first kiss, get your first 100 on a test, listen to your favorite music, debate and discuss, touch, taste, feel, hear, smell, think, act, have ideas, the reason you can live.
I believe in God. Do you?