Sure, but this is physical death, something a believer can face.
For anyone who eats and drinks without recognizing the body eats and drinks judgment on himself. That is why many among you are weak and sick, and a number of you have fallen asleep. Now if we judged ourselves properly, we would not come under judgment. (1 Corinthians 11:29-31)
So when you are assembled and I am with you in spirit, and the power of our Lord Jesus is present, hand this man over to Satan for the destruction of the flesh, so that his spirit may be saved on the day of the Lord. (1 Corinthians 5:4-5)
Believers can die for sin, without being lost forever.
Departing from Christ is apostasy, it has little to do with losing salvation, it's actually what happens if you reject faith.
The context here is important, Paul is talking about the bema judgment, it was a sporting event trophy.
Do you not know that in a race all the runners run, but only one gets the prize? Run in such a way as to get the prize. Everyone who competes in the games goes into strict training. They do it to get a crown that will not last, but we do it to get a crown that will last forever. Therefore I do not run like someone running aimlessly; I do not fight like a boxer beating the air. No, I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize. ( 1 Corinthians 9:24-27)
The sacrifices he is warning them are the Levitical ones, the sacrifice of Christ was once and for all. He makes this point earlier in Hebrews 6:4-6. He is talking about falling away from the faith which is apostasy, not carnality.
If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. How much more severely do you think someone deserves to be punished who has trampled the Son of God underfoot, who has treated as an unholy thing the blood of the covenant that sanctified them, and who has insulted the Spirit of grace? (Hebrews 10:26-29)
What your holding fast to is faith in the risen Savior, and the dog and the pig never became a lamb, that's why they returned to the muck and mire.
Different circumstances, there was no original sin, they chose to rebel and while God gave them time to, never repented of anything.
Grace and peace,
Mark