God exists. He is the One overseeing the affairs of the world. He is the One who manages the cause of this world. He exists. There should not be any question about his existence.
The whole world declares the existence of God. We can see the existence of God in many ways through His work of creation. When considering the beautiful creations, you will agree that this can only be the masterpiece of an intelligent Creator. See the strength and glory of God revealed in the majestic animal kingdom. God is great. God really exists.
Asking for the proof of God's existence, we can realize that God has shown this long ago in the land of Egypt. Pharaoh demanded to know who was that God at whose word he would have to let the Israelites go. God proved himself mightily through great miraculous works in the land of Egypt. Egypt was virtually destroyed by the power of God because He had to prove to Pharaoh that He was God.