God of Abraham, Isaac and Jacob is not a creation of mind. You can make others believe many things. You can make yourself believe anything. My dad said so, therefore it must be true. The parable of the sower in the ear of someone who after his Sunday breakfast drives his car to a church's car park differs from the same parable in the ear of someone who went on his way without a sack or staff or bread or money or two garments.
Scripture read in the armchair roams around the surface of the brain.
Only with this kind of humility we can talk to a person of a different creed without arrogance and disregard. Without doubt there is knowledge. The certainty that Lord God the ruler gives reward and punishment leads to obedience. Knowledge is a function of the brain. Faith pierces the whole being of the faithful.