Why do Christians believe that Jesus offered Himself to God for our salvation?

The belief that Jesus offered Himself as a sacrifice is rooted in the understanding of atonement, where He not only fulfilled the role of the high priest but also became the perfect sacrifice without spot or blemish. By presenting Himself to God, He was securing a definitive atonement for the sins of His people. This act is not an offer made to us but a divine transaction where the acceptance of Jesus' sacrifice by God assures us of our acceptance in Him. Therefore, the efficacy of salvation hinges on His offering, which God accepted, demonstrating that true faith hinges on this divine redemptive act.