Q. Can you please help me understand 2Peter 2:20-21 and how it lines up with OSAS?
A. 2 Peter 2:20-21 reads,
If they have escaped the corruption of the world by knowing our Lord and Savior Jesus Christ and are again entangled in it and overcome, they are worse off at the end than they were at the beginning. It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them.
The context of 2 Peter 2 is false teachers and their destruction. From other clear passages explaining the certainty of our salvation and the Lord’s commitment not to lose even one of us, we can conclude that those Peter refers to are not and never were saved. Knowing the Lord and knowing the way of righteousness does not mean that a person has believed in his or her heart. The Greek words used there are all forms of gnosis, which means to know. The Greek word for believe is not related to the word for knowledge, and it doesn’t appear anywhere in the passage.
Those Peter is describing have learned enough to be teachers, but haven’t believed what they’ve learned and are actually leading their students astray. Peter said it would be better for them if they had remained ignorant. As Jesus said to the Pharisees, “If you were blind you would not be guilty of sin, but now that you claim to see your sin remains.” (John 9:41)
Speaking about false teachers John said, “They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us” (1 John 2:19).