Why Jesus?

Before our salvation we were in disagreement with God and disobedient to God. After receiving salvation through Christ, we became new creations and as new creations we were reconciled to God. The person we were prior to being reconciled to God, died on the cross with Jesus, when we received Him as our savior.

...in Christ God was reconciling the world to himself,
not counting their trespasses against them,...

2 Corinthians 5:17-21
Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come. All this is from God, who through Christ reconciled us to himself and gave us the ministry of reconciliation; that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation. Therefore, we are ambassadors for Christ, God making his appeal through us. We implore you on behalf of Christ, be reconciled to God. For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.