How do we know that Jesus' death was necessary for salvation?

The necessity of Jesus' death is underscored in multiple passages within Scripture, where it is shown that He came to be a ransom for many (Mark 10:45). His sacrifice fulfills God's justice, as sin carries with it guilt and shame that must be addressed. By willingly offering Himself on the cross, Jesus bears the punishment rightly due to sinners, satisfying divine justice while simultaneously providing a means of salvation. His death and resurrection are not just historical events but the crux of God's redemptive plan for His elect, demonstrating how He can remain just while justifying the ungodly.