Forgiveness is as much at the center of Christianity as faith (trust).

BLUF

Without forgiveness, there is no trust. Without trust, there is no Christianity.

Digging in

It is inarguable that faith (trust) in Jesus Christ as Savior is at the center of Christianity. Trust and forgiveness are tightly bound; they might as well be two sides of the same coin. Not only are we forgiven, but we make the audacious claim to forgive others in the Lord’s Prayer.

To forgive someone means to trust them; this seems obvious. When Our Father forgives us, He trusts us not to sin again, even if that trust is misplaced (Our Father has hopes, too, you know?). When we fail to forgive others, we fail to trust Our Father; it denies our faith. The question to ask is, "Do we trust Our Father to do good out of the bad someone else has done?" (see Genesis 50)