The simple explanation is as you say. But if you understand the proof that God exists, and then find the proof that the Bible is the Word of God, your faith will be strengthened in the direction that God exists in the minds of people. Why? Because God says it in His Word.

Believing God or not believing Him was the original problem that people had. If they had simply believed God in the Garden of Eden, rather than the snake - btw, the medical has two snakes on a pole - they would not have sinned, and we would not exist in a corrupted state that dies after a while.