Bill, the book of Hebrews completely destroys your OSAS foundation, causing it to crumble.
I’ve often heard it said that the doctrine taught in Hebrews is only for the Jews. That’s bull crap. Christians have no problem accepting the blessings given in the book, (intercessory prayers of Christ, supernatural faith, divine provision, access to the throne of grace, etc.). If one aspect of Hebrews is to be applied to Christians, then so should the "whole counsel" of the book.
Some scriptures that comes to mind is Hebrews 6:4-8 (KJV)
(4) For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
(5) And have tasted the good word of God, and the powers of the world to come,
(6) If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
(7) For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God:
(8) But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.
It is apparent that this is speaking of a BELIEVER!!! Notice it says "once enlightened", "tasted of the heavenly gift" "were made partakers of the Holy Ghost". You cannot partake of the Holy Ghost by merely attending church, taking communion, being baptized, etc.. You are only a partaker of Him, when He is in you! He has "tasted" the word of God, and enjoyed the "powers of the world to come".
It would be impossible for an unbeliever to be given this privilege by God! Do you know of any unbeliever/sinners who have enjoyed the powers of the world to come?
semi, you are right in the fact that Heb 6: 4-8 doesn't support OSAS.
Heb 6: 4-8
 For it is impossible for those who were once illuminated, have tasted also the heavenly gift, and were made partakers of the Holy Ghost,  Have moreover tasted the good word of God, and the powers of the world to come,  And are fallen away: to be renewed again to penance, crucifying again to themselves the Son of God, and making him a mockery.  For the earth that drinketh in the rain which cometh often upon it, and bringeth forth herbs meet for them by whom it is tilled, receiveth blessing from God.  But that which bringeth forth thorns and briers, is reprobate, and very near unto a curse, whose end is to be burnt.
 "It is impossible"... The meaning is, that it is impossible for such as have fallen after baptism, to be again baptized; and very hard for such as have apostatized from the faith, after having received many graces, to return again to the happy state from which they fell.
Bill usually has ahout 50 chapter and verse that he rewrites the meanings
for, why not this time? Could it be the free ticket video?