All our sins are forgiven. Every single one. God is pure love. The Lamb will be worshiped as God because it is God

In Christian theology, the concept of "the Lamb of God" refers to Jesus Christ, and the belief is that his sacrifice on the cross atones for the sins of humanity. This sacrifice is seen as a cleansing and forgiveness for sins, both past and present, for those who believe in Jesus. The phrase "Lamb of God" appears in the Bible, notably in John 1:29, where John the Baptist identifies Jesus as such.