The Bible says to "contend for the faith."(Jude 1:3) You will be amazed at what you can say to someone if your tone is in the spirit of gentleness. Study the New Testament to see how confrontational Jesus was when He spoke to people about their salvation. He wasn't afraid to call sin "sin," and Hell "Hell." Imitate Him. Never hesitate to use fear as a motivator for a sinner to flee to the Savior. The world will frown on this, and many within the Church may even discourage it. But any fear a person may have now because of your words of warning will be nothing compared to the fear he will have if he falls into the hands of the living God. The Lake of Fire should motivate us to cast aside our fears of rejection that come in the guise of not wanting to offend people. There goes another minute. Gone forever. Go share your faith while you still have time.