The Devil at first starts with something that is correct at the beginning, and then later on disingenuously mixes it with something else false❗

People are then deceived very easily by this lie. So, through his servants, Satan says to Christians, “We Christians must be sanctified.” And he deceives them by saying, “People are saved when they believe in Jesus as their Savior. But after being saved, they must repent everyday, and only then are they sanctified." 

But mankind’s sins cannot be washed away through prayers of repentance. One can give all the prayers of repentance he wants to blot out his sins, but do his sins really disappear?

Of course not. So, the Bible states, 

“‘For though you wash yourself with lye, and use much soap, yet your iniquity is marked before Me,’ says the Lord GOD” 

(Jeremiah 2:22). 

Yet despite this, Satan has been deceiving people all this time, insisting that they can receive the remission of their sins only if they give prayers of repentance. To remove our hearts’ sins, we must listen to the gospel of the water and the Spirit and believe in it.

Virtually every church teaches that Jesus Christ took upon our sins on the Cross and was crucified. Jesus Christ is actually God Himself, but He came to this earth incarnated in the flesh of man, and through the baptism He received from John the Baptist, He received all the filthy sins of the world.

When His people, made in the likeness of His image, fell into sin, Jesus came to this earth in our own human image to save them. And by shouldering all the sins of mankind and of the world on His own body, and by being punished on the Cross in our place in this sinful state, He made it possible for us to escape from our punishment.

https://www.bjnewlife.org/english/bstudy/sermons_263_Genesis.php