He Remembers Sins No More

When Adam and Even came into this world they were made in the image of God - fully alive. But when sin entered the world they died spiritually. When Jesus came and offered himself as the lamb of God, he took away sins so we could be forgiven and be made alive in Christ. Hebrews 10 To gain full assurance of salvation you need to take a deep look at the cross and see what Jesus did on your behalf. Colossians 1:21-22 talk about being reconciled to Christ and how we are holy and blameless. Verse :23 says, "If indeed you continue in the faith" Can you please explain what it means by IF?When John the Baptist said "behold the Lamb of God who takes away the sin of the world", what sin? Is it the sin of spiritual death or unbelief?God is ultimately stronger, but in reading Daniel 10:12-13, I wonder are the devil and his angels able to block or delay answers to our prayers?Many people read a verse and then argue over the interpretation. Isn't the love of the Lord more important?