More Christian arrogance to just assume it can't happen. But it does. If Satan can become "corrupted" (I would use a very different term), then what chance do we humans stand?
The Bible doesn't agree with you. 2 Peter 2:20-22
Well, I think it might be more appropriate to say 1 Peter 1:23 doesn't appear to agree with 2 Peter 2:20. My opinion matters not.
So here we seem to have a glaring contradiction in the Bible. What to do? We could just say the Bible is wrong and go with the Koran or something. The other option might to be say that perhaps there is a error in translation or my own understanding.
Turns out the translation is fine, so that leave the possibility that I don't understand something and that is the cause of the apparent contradiction. Let's see if we really understand what it being said.
It looks like 2 Peter 2:20-22 is talking about the false prophets mentioned in 2 Peter 2:1. The context thus shows 2 Peter 2:20-22 is talking about false prophets. Nowhere in that chapter is it explicitly stated that these folks were born again. The closest it comes is to say they once, "knew Jesus." Lot's of people "know" Jesus but are not born again. The key is to understand they are called false prophets.
1 Peter 1:23 on the other hand is explicitly talking about being born again.
A common mistake when reading the Bible is assuming that all of it is written to all people. That is simply not the case.
Rom 11:13,
For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify mine office:
Exod 12:3,
Speak ye unto all the congregation of Israel, saying, In the tenth [day] of this month they shall take to them every man a lamb, according to the house of [their] fathers, a lamb for an house:
Eph 1:1,
Paul, an apostle of Jesus Christ by the will of God, to the saints which are at Ephesus, and to the faithful in Christ Jesus:
There we have some things being said to the Gentiles, other things said to Israel, and yet other stuff said to the saints. God often says one thing to one group and something totally opposite to another group. That could appear to be a contradiction unless the reader understands God was talking to different people, at different times, and under different circumstances. We need to ascertain to whom something was written and when it was written. Situations changed as history moved on; Eden, no law, law, Jesus, Christianity, and finally the restoration of all things are all unique times, each having its own set of standards.
Neglecting to or about whom it is written, and when it was written causes no end of confusion when it come to understanding the scriptures. In that sense, it's no different than any book ever written. Can you imagine how confusing Harry Potter would be if someone kept confusing Harry with Severus Snapes? It would make no sense whatsoever.