For it is impossible as regards those who have once for all been enlightened, and who have tasted the heavenly free gift, and who have become partakers of holy spirit, and who have tasted the fine word of God and powers of the coming system of things, but who have fallen away, to revive them again to repentance, because they impale the Son of God afresh for themselves and expose him to public shame. Hebrews 6:4-6
"This leads to the conclusion that only annointed members of the faithful and discrete slave class could become apostates. Only the annointed receive the holy spirit. Only the annointed are qualified to taste the fine word of God; the other flock needs the slave class to feed them this spiritual food. The other flock cannot fall away from what they never were part of, therefore, they could not become apostates by this definition.
Very few of us are or ever were annointed members of the slave class. Some of us are not even among the "other flock". In light of this, is it appropriate to refer to all of us as "apostates"?"
The only thing that applies specifically to the anointed is “have tasted the heavenly free gift.” The Christian Greek scriptures was written to the anointed because only the anointed were in the Christian congregation in the first century C.E. but the principle still applies to the great crowd of other sheep.
w69 8/15 p. 511 Questions From Readers
Jewish religious leaders who came to Galilee to see and hear Jesus Christ on one occasion had already taken counsel as to how they might destroy him. (Matt. 12:14) In Galilee they saw Jesus cure a man who was unable to speak, was blind and demon-possessed. Instead of admitting the obvious fact, that Jesus was performing miracles by means of God’s holy spirit, the Pharisees maliciously accused him of doing it by means of the power of Satan. After showing how wrong they were, Jesus said:
“Every sort of sin and blasphemy will be forgiven men, but the blasphemy against the spirit will not be forgiven. For example, whoever speaks a word against the Son of man, it will be forgiven him; but whoever speaks against the holy spirit, it will not be forgiven him, no, not in the present system of things nor in that to come.”—Matt. 12:31, 32; Mark 3:28, 29; Luke 12:10.
With these religious leaders it was not just a case of failing to be convinced by Christ’s teachings and works. The people of Chorazin and Bethsaida had been so preoccupied with their way of life that they did not accept Jesus and repent; yet they evidently will benefit from God’s mercy and have a resurrection and a future opportunity to learn the way of righteousness. (Matt. 11:20-24) Nor with the Pharisees was it a matter of blaspheming and opposing true worshipers because of ignorance of God’s will. Saul of Tarsus had been such a man, but he was shown mercy and forgiven. (1 Tim. 1:13-16) Rather, these religious leaders were rotten in their hearts right to their core, and Jesus knew it. Unlike the common people, they had a considerable knowledge of God’s Word. Now they had seen an evident demonstration of God’s spirit. Nevertheless, they completely rejected what was accomplished by Jehovah’s spirit and blasphemously credited Jesus’ miracles to Satan’s power. How bad could one get?
Was their sin serious? Jesus, “knowing their thoughts,” realized that they were deliberately—with their eyes wide open to the facts—sinning against knowledge of the operation of the holy spirit. He indicated that they were “guilty of everlasting sin.” (Matt. 12:25; Mark 3:29) Because of the context of those words, and in view of the fact that Jesus later said that many religious leaders of that time were headed for eternal destruction in Gehenna, it seems that they had committed the unforgivable sin. (Matt. 23:15, 33) Their sin was unforgivable, not because Jehovah is not a forgiving God, but because they were past repentance and beyond being retrieved. Their sin left them in total infidelity as to the real worship of Jehovah. Even in the system of things to come, one guilty of such sin could not be forgiven.
Could one sin against the holy spirit today, and thus be beyond forgiveness? Yes, that is possible. A person could become so hopelessly corrupt in mind and heart as to carry sin to the point of sinning against the spirit. And one need not be a spirit-anointed Christian to do so. Remember that those Pharisees were not anointed Christians and yet they committed unforgivable sin.