Forgive me if I don't devote too much time on watching the video, I stopped at 1:23 as by then what the speaker on the video was saying already didn't match the Word of God.
We are blessed that God has preserved for us a Book that is Gods very word, which contains what we need to learn and grow as Christians, and according to that Book, doctrine is indeed very important.
1 Timothy 4:16, “Pay close attention to yourself and to your teaching; persevere in these things, for as you do this you will ensure salvation both for yourself and for those who hear you.”
Jude 1:3, “Beloved, while I was making every effort to write you about our common salvation, I felt the necessity to write to you appealing that you contend earnestly for the faith which was once for all handed down to the saints.”
2 John 1:7-11, “For many deceivers have gone out into the world, those who do not acknowledge Jesus Christ as coming in the flesh. This is the deceiver and the antichrist. Watch yourselves, that you do not lose what we have accomplished, but that you may receive a full reward. Anyone who goes too far and does not abide in the teaching of Christ, does not have God; the one who abides in the teaching, he has both the Father and the Son. If anyone comes to you and does not bring this teaching, do not receive him into your house, and do not give him a greeting; for the one who gives him a greeting participates in his evil deeds.”
Galatians 1:6-9, “I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel; which is really not another; only there are some who are disturbing you and want to distort the gospel of Christ. But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed! As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed!”
Matthew 24:11, “Many false prophets will arise and will mislead many."
The Word of God is what emphasises doctrine, not men, as it is indeed very important to our Christian walk and witness.