Ask a Christian how they know the Bible was indeed inspired by God, and not the Devil. Or ask them how they know their "experiences" are of God, rather than of something else. Then you will see how much faith they have in reason. They will of course abandon reason immediately, as though they had inadvertently picked up a burning ember. Feelings are their so-called life.
They are like the boy who pretends to own his father's car, yet when the police pull him over he pleads innocence. Christians get the benefit of believing they possess the highest, but they do not take responsibility for it. They do not hesitate to preach their wisdom, but when pressed on a telling point they reply: "The Bible says so."