Ephesians 2:4,5

But God, who is rich in mercy, because of His great love with which He loved us, even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved.)

God sent His son Jesus to die for our sins and stand in our place so we could stand with Him.  All the old sin and the old self have passed away, and we have been made new.  When the devil tries to remind us of what we were, we need to remind him of who we are in Jesus.  Cast down the doubt he tries to put inside and speak the light of the word and defeat the doubt.