Does Doctrine Matter?

There are many who hold the belief that doctrine does not matter. The reasoning is that so long as a person believes something, they'll be okay for eternity. Yet, II John 9 tells us "Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son." Doctrine does matter! It matters a great deal! As we know we must abide in Christ, and He in us (John 15) for eternal life. It is very important that we hold to His doctrine!