Jude's message was simple - opposition will come and false teachers will rise up, but Christians should "defend the faith."
Jude 1:3 -- "Dear friends, I had been eagerly planning to write to you about the salvation we all share. But now I find that I must write about something else, urging you to defend the faith that God has entrusted once for all time to his holy people."
Jude then goes on to give practical ways to accomplish this mission. First, is to reject all falsehood and immorality:
Jude 1:18-19 -- "They told you that in the last times there would be scoffers whose purpose in life is to satisfy their ungodly desires. These people are the ones who are creating divisions among you. They follow their natural instincts because they do not have God’s Spirit in them."
Second, is to build up your own faith through prayer:
Jude 1:20 -- "But you, dear friends, must build each other up in your most holy faith, pray in the power of the Holy Spirit."
Jude 1:24-25 -- "Now all glory to God, who is able to keep you from falling away and will bring you with great joy into his glorious presence without a single fault. All glory to him who alone is God, our Savior through Jesus Christ our Lord. All glory, majesty, power, and authority are his before all time, and in the present, and beyond all time! Amen."
It is a choice to determine that God's truth is more valuable than anything else. What do you choose?