You sure about that? 26 For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, - Hebrews 10:26
Well, I am certain of at least one thing...you do not read the context of the few verses you attempt quote as rebuttals. This passage from Paul's letter to the Hebrews is discussing the removal of the value of animal sacrifices as effectual, now that the Son of God has provided the single, one-time sacrifice of Himself. He is cautioning them not to rely upon a hybrid system as it is insulting to Spirit of grace.
It may do the RCC good to think about how they crucify to themsleves often the precious sacrifice of Christ through their abberant transubstantiation ritual.