Continuing down a ways in Hebrews 6, the author (maybe Paul, maybe not) has a striking piece of doctrine: no repentance after baptism for those who have "fallen away." The text does not specify what acts constitute this type of apostasy.
It's a little hard to unpack, so I recommend a translation other than the King James Version. I'd post the verses here, but I want to keep these posts short and readable.
For a person in my position, once full of belief, now full of unbelief, it strikes a chord. The God of this author wouldn't let me back in the fold even if I so desired.