One of the most serious warnings in the letter and in the Bible is found in Hebrews 6:4-6, and is considered by many to be the most difficult verse to interpret in the entire New Testament.

Does it line up with the Arminian theology that says there are believers who have lost their salvation, or does it confirm the Calvinist view that argues people like this were never believers, or is it the hypothetical "theology" view that teaches that these events had not actually occurred?

I think that none of these apply, as it is important to understand who the audience of this letter is and what was happening to them.