2 Peter 2
20 For if, after they have escaped the pollutions of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and overcome, the latter end is worse for them than the beginning.
21 For it would have been better for them not to have known the way of righteousness, than having known it, to turn from the holy commandment delivered to them.
These are those who were never believers. They were false teachers. (2 Peter 2:1).
Stranger
I apologize for not addressing this. I don't know how I missed it.
Anyway, I have to disagree. Notice they "escaped the pollutions of the world
through the knowledge of the Lord and Savior Jesus Christ".
Nonbelievers don't possess this knowledge. Escaping the pollutions of the world means they are no longer a part of the world. They no longer walk in darkness. Through the knowledge given them they were able to turn their lives around.
Becoming entangled "again" indicates he was entangled at one time, became free of that entanglement but now is entangled again. The time between the 1st and 2nd entanglement is when he was free of the world. He was basically walking in righteousness.
Verse 21 tells us he knew "the way of righteousness". Nonbelievers don't possess this knowledge. To turn from the Holy Commandment is another indication that he was not a nonbeliever. Also note that the Holy Commandment was given to him. God would not give this knowledge to a nonbeliever. The individual would have to seek it out, which would make him a believer.
That's how I interpret that passage.
i