It seems to me that a person can only commit the unpardonable sin if they don't repent and die not repenting. Well, there is debate within the commentaries in terms of whether or not a Christian who has apostatized could ever repent after that. The idea is that there can't be a second rebirth, and thus these people cannot repent before dying. Paul says that it's impossible, so if we assume that a true Christian is capable of apostatizing, then should a true church ban those members from ever becoming a member again? Should it be assumed that a former true Christian would be lying or deluding himself if he ever says that he repents and wants to become a Christian again?
For a church organization to ever take on the role of judgement concerning a persons salvation, is about as cultic as you can get. They would obviously have to hold some kind of “pre-destination” theology. Basically saying, you have one chance of salvation, if you throw it away, it is proof you were pre-destined for hell-fire, and so we will never accept you back as a repentant individual. Such theology is not of God but is of Satan the Devil. There is only ONE sin that Jesus said was un-forgivable…. the blasphemy against the Holy Spirit [that topic is covered in a study on this website].
Second, if such a person were to truly repent and try to become a Christian again, would Jesus allow it? Paul says that these people are crucifying Christ all over again, which is impossible. Now, maybe these people can never become Christians again, because Jesus would have to die for their sins for a second time. If they again apostatized and wanted to become a Christian again, Jesus would have to die for their sins a third time, etc. Is this what Paul was saying?
No I do not see that Paul is saying that. Christ is today our High Priest interceding for us when we sin. His sacrifice is still cleansing sinners, ON AN ON-GOING state. I think Paul is using such strong words as a warning that “playing around” with Christianity - take it leave it, take it leave it - is a very serious matter, nothing to be taken lightly or flippantly.
It was Peter who said, some of Paul’s writings were hard to understand, and many get twisted out of the context of the Bible, especially the New Testament.
The debate probably comes with those who believe everything is pre-destined..... some will be saved [known by God] and some will not be saved [also known by God]. Everything is already written out, and it makes no difference if you try to circumvent what God has already decreed. I think Calvin was a pre-destined guy. So if someone is already pre-destined for hell, even being a Christian for a while, it would eventually work that he walks away from Christianity, and can not come back to it, because he was pre-destined for hell-fire anyway.
That kind of theology is from planet Pulto, and little green men from Mars.
Such theology marks a so-called Christian group into a CULT!