The Jewish Day of Atonement and is the most holy day of the Jewish calendar. It is observed 10 days after Rosh HashanaThe Jewish New Year. more. Devotees fast and pray the whole day seeking repentanceTurning away from sin and to God in hopes of obtaining forgiveness and is associated with a change of mind and heart. more and atonementA term referring to how Christ’s suffering and death on the cross expiates sin and reconciles humans with God. There are various theories regarding ... more for sins.