[Ali Imran]

Man is judged by his acceptance or rejection of Christ. In the Bible, the sin of unbelief isn't simply failing to believe God, it's the deliberate choice not to believe what God has said. Unbelief is the willful rejection of God's revelation.

Paul wrote letters to the Galatians telling them not to believe Peter. Centuries later, some people decided to canonize those letters into the Bible.

Today, you believe what Paul wrote is God's word. 

Surely you have been misled.