This book has a bunch of weird things in it. Jude, however, draws the same distinctions that all writers do between godly and ungodly. In fact, he uses that work, "ungodly", several times. His main concern is to correct and encourage people not be be ungodly. He lists several bad examples from the Old Testament -- Cain (Genesis 4:1-9), Sodom and Gomorrah (Genesis 19:24ff), Korah (Numbers 16:1-33), and Balaam (Numbers 22:27ff). He threatens Gods judgment on ungodliness. He encourages godliness with the promise of joy in God's presence.
The benediction is spectacular, one of the most beautiful in all the Bible. God is able to keep you from falling and to present you blameless. He's able to do what we cannot!