Salvation CANNOT be lost if you truly belong to Christ.

This should be a challenge also to the so called sinless perfectionists. But I think rather than calling it the unpardonable sin, we should call it the unpardonable STATE. Those that perish in the unbelieveing state, will immediately go straight to hell. Here's my take on this passage regarding the false doctrine of salvific loss.

Perhaps the sinless perfections should heed this passage as a warning.