What does the Bible say about the religion of grace?

The religion of grace is central to Reformed theology, underlining that our salvation is entirely based on the grace of God through Jesus Christ. This is illustrated in the account of Cain and Abel, where Abel's faith and sacrifice were accepted by God because they pointed to the ultimate sacrifice of Christ. In contrast, Cain's offering was rejected because it stemmed from his own works rather than faith. This concept reinforces that our acceptance before God is not contingent on our actions, but solely on Christ’s redemptive work, fulfilling the promise of salvation solely through grace.