None of these were children of the devil, seed of the serpent, or they would have never been washed, sanctified, justified in the name of the Lord Jesus. It's not even in the context of the passage.
Actually, it is very much the context.
Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God. And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God.
So Paul says that the unrighteous don’t inherit the kingdom of God and that they were the unrighteous. So they were in the category that doesn’t inherit the kingdom of God, but now they’re not in that category, and they do inherit the kingdom of God. It is definitely the context.