Many people do not place much importance on the doctrine of Christ, when they say, "It doesnt make any difference what a person believes, as long as he is honest and sincere." But when we truly understand that the biblical meaning of the phrase, the doctrine of Christ, includes all of His teachings, then we see the folly of such a statement.
II John 9 tells us that "whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God." Is doctrine important?
When Jesus finished the sermon on the mount (Matt. 7:28), people were astonished at his doctrine, (his teachings). Are all of Christs teachings important?
In Matt. 7:21, Christ said, "Not everyone that saith unto me, Lord, Lord, shall enter into the Kingdom of heaven; but he that doeth the will of my Father which is in heaven." The will of the Father includes all of Christs teachings. Is the will of the Father important?
In Romans 1:16, Paul said, the gospel is "the power of God unto salvation". The gospel is the doctrine (teachings of Christ). Is the gospel important?
When we consider that doctrine is all of the teachings of Christ, the will of God, and the gospel, then we would never make a statement saying "doctrine is not important".
Remember the guideline: Its the truth that makes one free, not how one might feel or think. The truth, which is Gods Word, tells us that doctrine is very important; and if we dont abide in God's Word, we dont have God.