Read your Bible.
1 Timothy 3:15
if I am delayed, you will know how people ought to conduct themselves in God's household, which is the church of the living God, the pillar and foundation of the truth.John 14:6
Jesus answered, "I am the way and the truth and the life. No one comes to the Father except through me.Matthew 18:17
If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, treat him as you would a pagan or a tax collector.