Doctrine is important. One slight veer in doctrine will lead to massive difference in practice.
Doctrine isn’t the most important thing
1 Corinthians 13:2--And though I have the gift of prophecy, and understand all mysteries, and all knowledge; and though I have all faith, so that I could remove mountains, and have not charity, I am nothing.
1 Corinthians 13:8--Charity never faileth: but whether there be prophecies, they shall fail; whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away.
1 Corinthians 13:13--And now abideth faith, hope, charity, these three; but the greatest of these is charity.
And this I pray, that your love may abound yet more and more in knowledge and in all judgment;10 That ye may approve things that are excellent; that ye may be sincere and without offence till the day of Christ.
Love is there first—your motivation for knowing more should be so you can be helpful to others, not to be a know-it-all, or the leader of the stupid ones.
Right doctrine leads to right behavior; right behavior leads to right doctrine.
People go to unbiblical extremes, the other sides pushes against that extremism by going to an equally unbiblical extreme in the other direction. It’s about winning/being different from the stupid people
Wherefore if ye be dead with Christ from the rudiments of the world, why, as though living in the world, are ye subject to ordinances,21 (Touch not; taste not; handle not;22 Which all are to perish with the using;) after the commandments and doctrines of men?23 Which things have indeed a shew of wisdom in will worship, and humility, and neglecting of the body: not in any honor to the satisfying of the flesh.
1 Timothy 4:1-3
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;3 Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth.
A test for false doctrine--it doesn’t lead to love, but to making up rules for people to obey.
False doctrine leads to self-righteous ego; true doctrine leads to humility and love.