b. Through what does God save us, because of His mercy?
Answer: Because of God's mercy, He saves us through the washing of rebirth and renewal by the Holy Spirit, (verse 5).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
This is the promised Holy Spirit received at baptism, Acts 2:38. The "washing of rebirth" is baptism--being born again. "Renewal by the Holy Spirit" is the rising from the grave of baptism to walk a new life with the Holy Spirit working in you through the Word of God.
