The redemption of sinful people via blood sacrifice is the single strongest theme in the entire Christian canon (the Bible). Jesus' death as payment for other people's sins is prophesied repeatedly, and confirmed after the fact. e.g. Isaiah (written 700 years before Jesus' birth) https://www.biblegateway.com/passage/?search=Isaiah+53&versi... and this letter to the Hebrews written about 30 years after his death https://www.biblegateway.com/passage/?search=Hebrews+9-10&ve...