A Christian is a person upon whom God has shown mercy, and here Luke also identifies Christians as those who fear God. In Luke 18:2, 4, Jesus reveals in a parable that it is the unconverted who do not fear God. His followers fear God.
Elsewhere, the Bible identifies Christians as those who fear God. Notice Acts 9:31: "Then the churches throughout all Judea, Galilee, and Samaria had peace and were edified. And walking in the fear of the Lord and in the comfort of the Holy Spirit, they were multiplied." Later, Luke writes: "And they said, 'Cornelius the centurion, a just man, one who fears God and has a good reputation among all the nation of the Jews, was divinely instructed by a holy angel to summon you to his house, and to hear words from you" (Acts 10:22). Cornelius, a Gentile prepared for baptism, is called "one who fears God."
Hebrews 5:7 describes Jesus' fear of God: ". . . who, in the days of His flesh, when He had offered up prayers and supplications, with vehement cries and tears to Him who was able to save Him from death, and was heard because of His godly fear." Even Jesus, who knew God better than anyone who had ever walked the face of the earth, feared God. Note the special attention paid to the fact that God answered His prayers because He did.
God is holy. He is different to a level so far above mankind that those who truly know Him do not lose that apprehension and awe that comes from the privilege of being in the presence of sheer, powerfully pure holiness. Fear plays a large part in a good relationship with God.
Genesis 3:10 is the first time a form of fear appears in Scripture, and interestingly, it is in the context of sin. Adam responds to God, "I heard Your voice in the garden, and I was afraid because I was naked; and I hid myself." Elsewhere, the English word "fear" and its cognates appear in many contexts and forms: "feared," "fearful," "fearfully," "fearfulness," "fearing," and "afraid." These terms appear over 720 times in Scripture.
We tend to be uncertain about fearing God because we think of fear as a negative characteristic. We feel that we should love Him rather than fear Him. However, as we study God's Word and experience life with Him, we come to understand that, at the foundation of loving God, godly fear modifies our highly variable faith in God and love for God in significant ways.
All of those forms of "fear" express a wide range of emotions. Feelings such as dread, distress, dismay, trouble, terror, horror, alarm, awe, respect, reverence, and admiration may all appear as "fear" in Scripture. The fear that God desires in us is a good, positive, motivating quality.
This fear is one that we do not naturally possess. Recall Psalm 34:11: "Come you children, listen to me; I will teach you the fear of the LORD." How do we learn the fear of God? Psalm 33:8-9 gives insight: "Let all the earth fear the LORD; let all the inhabitants of the world stand in awe of Him. For He spoke, and it was done; He commanded, and it stood fast." Godly fear is one of a deep and abiding respect that grows as we learn—from within a continuing, intimate relationship—of His character, His purpose, and His powers. The unconverted do not have this relationship as a sustaining presence.
John W. Ritenbaugh
Sin, Christians, and the Fear of God