Justification by Faith means, "The theological principle, emphasized in Protestantism, that salvation comes to an individual by God's grace through faith, so that to be "declared righteous" or "justified," or "saved" is on the (sole) basis of one's faith in Jesus Christ apart from any works of merit (Rom. 1:17; 3:28; 5:1)."1 (emphasis mine)
Keach's Catechism declares justification by faith as, "Justification is an act of God's free grace, wherein He pardons all our sins, and accepts us as righteous in His sight, only for the righteousness of Christ imputed to us, and received by faith alone. (Rom. 3:24; Eph. 1:7; 2 Cor. 5:21; Rom. 5:19; Phil. 3:9; Gal. 2:16)."2
Similarly, the Westminster Shorter Catechism defines justification by faith as, "Justification is an act of God’s free grace in which he pardons all our sins and accepts us as righteous in his sight for the sake of the righteousness of Christ alone, which is credited to us and received by faith alone."3
Does God cause faith? Prior to the new birth, an individual is dead in trespasses and sins and incapable of belief or faith (Romans 3:9-12; 8:7; 1 Corinthians 2:14; Ephesians 2:1; Colossians 2:13). Regeneration by the Holy Spirit makes saving faith possible. Saving faith is something the individual does (Acts 16:31) but it is enabled by and in the response to the work of the Holy Spirit. The Greek word for "credited" (Romans 4:3-6) (λογίζομαι, logizomai) is rendered in the New Testament as numbered, reckoned, reason, suppose, take into account, consider(ed), and credit(ed). So, it is our faith that is credited as righteousness or is it what our faith is in? I think it is the latter. If it is our faith that considered righteousness then we fall into the error of E.P. Sanders and N.T. Wright. However, if our faith in the person and finished work of Jesus Christ, our righteousness is imputed to us. It is an alien righteousness (from outside of us).
Perhaps we are in agreement here? If so, great. Please forgive me for the technical answer. When writing about the great doctrines of the faith I do tend to "go long in the tooth". I am not trying to be pedantic.
1. Donald McKim, Westminster Dictionary of Theological Terms.
2. Keach's Baptist Catechism, Question 37
3. Westminster Shorter Catechism, Question 33