Religion is man, by his own efforts, seeking to win the approval of God. This is true of all religions (Islam, Judaism, Catholicism, etc.). Biblical Christianity is not a religion, but a relationship with God through the Person and work of the Lord Jesus Christ. Most think of Christians as people who seek to do good works for God in order to be saved; but this is wrong. Rather, a Christian is one for whom God has accomplished our salvation through the work of His Son, Jesus Christ.
From the biblical perspective, unsaved people are marred by sin and cannot cleanse themselves (Rom. 5:6-10; Eph. 2:1-3). Human good and morality has no saving merit before God (Isa. 64:6; Rom. 4:1-5; Eph. 2:8-9; Tit. 3:5). Work is necessary for our salvation; however, it is not the works we do for God that save us, but rather, it is ONLY the work of Christ that saves. Only Jesus lived a perfectly righteous life in the sight of God (Heb. 4:15; 1 John 3:5) and then died a penal substitutionary death on our behalf, bearing the punishment that rightfully belongs to us (John 3:16; Mark 10:45; 1 Cor. 15:3-4; 2 Cor. 5:21). The death of Christ forever satisfied God’s righteous demands toward our sin (Rom. 3:25-26; 1 John 2:2).
Salvation comes to us as a free gift (John 3:16; Eph. 2:8-9), paid in full by the Lord Jesus who bore our sin at the cross (1 Cor. 15:3-4; 1 Pet. 3:18), and who offers us eternal life (John 3:16; 10:28-30), and the gift of righteousness (Rom. 5:17; 2 Cor. 5:21; Phil. 3:9), by a simple act of faith in Jesus as our Savior (John 3:16; Acts 4:12). When the Philippian jailer asked Paul, “what must I do to be saved?” Paul replied, “Believe in the Lord Jesus, and you will be saved” (Acts 16:30-31). Believing in Jesus means we look to Christ as our Savior and accept His atoning work on the cross as sufficient to make us acceptable in the sight of God. Once saved, the Christian is called to a life of good works (Eph. 2:10; Tit. 2:11-14), but such works are the fruit of salvation and never the cause of it.
Steven R. Cook, D.Min.