Again you keep referring to your salvation and not addressing a false doctrine. If you have studied Catholicism they can do what you have just done and establish many if not all of their doctrines.
You state that Hebrews must be taken in its totality yet you have pulled verses out of different books of Scripture to establish a doctrine that is proven false when you take the whole word of God into account.
I am not questioning your salvation I am debating (this is a debate forum) what the Bible teaches in regard to OSAS and the Bible teaches that Christians will go into apostasy and the Bible names men who went into apostasy in both the Old and New Testaments.
There is one word many Christians choose to ignore when discussing doctrine and that word is if. There are more conditional promises in Scripture than absolute promises. Conditional promises begin with if.