The Book of Jude teaches on self indulgement not basic Christain doctrine disagreements. Please read it in it's right context before using it as a wholesale weapon to accuse those who do not follow your denomination's teachings word for word.
A good book to read for the Christian is Ephesians. It was written to preven problems in the church as a whole by encouraging the body of Christ to maturity in Him (a key phrase, especially, "in Him"). In the first chapter, for example, Paul tells all the things we have "in Him, some of which are:"
1. Chosen by God
2. Redemption through His blood;
3. the forgiveness of our trespasses;
4. we have obtained an inheritance, having been predestine
5. after listening to the message of truth, the gospel of your salvation--having also believed, you were sealed in Him with the Holy Spirit of promise
In Chapter 4, Paul exhorts to the brethren to unity, "entreat[ing] you to walk in a manner worthy of the calling with which you have been called (2) with all humility and gentleness, with patience, showing forbearance to one another in love (3) being diligent to preserve the unity of the Spirit in the bond of peace.
There is so much more in Ephesians about building up the saints, loving one another, putting on the full armor of God, that you may be able to resist in the evil day . . . to stand firm.
Paul teaches us that love seeks reconciliation like God did with us, that we are to live in a way that reflects God's light, which exposes darkness and evil. And the greatest evil is the lack of love.