What does the Bible say about grace vs religion?

In the narrative of the Prodigal Son, grace is exemplified by the father's unconditional love and acceptance, who represents God, while the oldest son embodies the rigid religious system. Grace waits patiently for the sinner to return, believing in their ability to change, whereas religion often demands strict adherence to rules without understanding the heart's condition. Scriptural references like Ephesians 2:8-9 remind us that salvation is a gift of grace, not a result of our works, thus highlighting the fundamental difference between the relationship established through grace and that maintained through religion.