Messianic Jews and Christians believe Yeshua (Jesus) is the one who makes atonement for our sins.
Christ came as High Priest of the good things to come, with the greater and more perfect tabernacle not made with hands, that is, not of this creation. Not with the blood of goats and calves, but with His own blood He entered the Most Holy Place once for all, having obtained eternal redemption… how much more shall the blood of Christ, who through the eternal Spirit offered Himself without spot to God, cleanse your conscience from dead works to serve the living God?
Hebrews 9: 11,12,& 14
Where previously sins were forgiven through animal sacrifices, charity (good deeds), and prayer, Messianic Jews believe the blood of Yeshua has made Atonement for sin and through faith in Him, sin is continually passed over.
[Yeshua] whom God set forth as a propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed,