How do we know that God's mercy is obtained through Christ?

According to 1 Peter 2:10, believers who once had no claim on God's mercy are now identified as God's people. This transformation is rooted in the redemptive work of Christ, who reconciles estranged sinners to God. Ephesians 1:4-5 further emphasizes God's preordained plan to adopt believers as His children through Jesus Christ. This signifies that while mercy was always there in God’s character, it was made manifest through Christ, making it accessible to those who believe. Therefore, believers can confidently claim the mercy and grace of God because it is fully realized in the person and work of Jesus.