Today, we have many false teachers who pervert the grace of God, turning it into a license for sensuality — teaching “once saved always saved” or “only believe.” They claim we don’t actually have to abide in Christ to be ‘in Christ,’ defying the word of God — about 90 passages that warn us about losing our salvation if we don’t overcome by God’s grace.
In New Testament days, they had the false doctrine of Gnosticism, which was their license to sin. We have “once saved always saved” and “only believe” instead, which produces similar, Christian-in-name-only results.
Jude writes:
3 Beloved, although I was quite eager to write to you about our common salvation, I found it necessary to write to you and urge you to contend for the faith that was once for all delivered to the saints. 4 For certain men whose condemnation was written about long ago have crept in unnoticed. They are ungodly men who pervert the grace of our God, turning it into a license for sensuality. By doing so, they deny God, who is our only Master, and also the Lord Jesus Christ.” TCENT