Many today say doctrine is not important but the Bible says it is.
2 John 1:9 – 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.
2 Timothy 3:16 – All scripture [is] given by inspiration of God, and [is] profitable for doctrine, for reproof, for correction, for instruction in righteousness:
Titus 2:1 – But speak thou the things which become sound doctrine:
2 Timothy 2:15 – Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.
Romans 16:17 – Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.
Revelation 2:14 – But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.
2 Timothy 4:3 – For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
Titus 1:9 – Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.
1 Timothy 1:3 – As I besought thee to abide still at Ephesus, when I went into Macedonia, that thou mightest charge some that they teach no other doctrine,
1 Timothy 1:10 – For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine;
Psalms 119:105 – NUN. Thy word [is] a lamp unto my feet, and a light unto my path.
Jude 1:3 – Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, and exhort [you] that ye should earnestly contend for the faith which was once delivered unto the saints.
1 John 4:1 – Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
2 Thessalonians 3:6 – Now we command you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us.
Psalms 119:– Thy word have I hid in mine heart, that I might not sin against thee.
Psalms 119:9 – BETH. Wherewithal shall a young man cleanse his way? by taking heed [thereto] according to thy word.
I could go on with more scripture but I think this is enough. But remember this, you can know the correct doctrine but without love and obedience to God, it is useless knowledge.