Combined with grave matter, this is the definition of a mortal sin: sufficient reflection and full consent of the will. If ones dies without repenting of such sin then he will not enter into the kingdom of Heaven. Leaving aside the question of sacramental Confession, how does what you present as Lutheran teaching differ from Catholic?
I would also say that I appreciate that you have returned to the question. I must appreciate that it is often difficult to present the Catholic position against what are multiple Protestant ones. You should also appreciate that there are some Protestants, at least from my point of view, who seem to take an absolute view that no sin would loose them their salvation.
A few thoughts; they’re likely not strictly connected to each other.
Perhaps the two of us as people have similar theology in regards to unrepentant sin, but I’ve never seen ‘mortal sin’ defined as willfully unrepentant sin before today.
Last I checked, Rome still demands ‘merits’ for salvation, or at least that’s what the Catechism said when I read it.
Whereas Scripture says, “By grace you have been saved, through faith, and this is not the result of works, so that no man may boast.”
And yes, I have seen some Christians embrace a once-saved-always-saved theology. I don’t think they’re exactly correct because Scripture does mention those who had faith and then turned away from it.
However, I tend not to pay that much attention, mostly because works-righteousness is a greater danger to salvation than a discussion about whether those who have fallen away have lost their faith or whether they never had faith in the first place.
I know that Protestants have a few different beliefs on a few different sticking points. And trust me, that bugs me when I talk with my fellows about Baptism and the Lord’s Supper.
But to be fair, Catholics have differences between each other too; they’re simply not out on the surface as much. I suspect, at least on this board, it’s because we LOVE debating people with Scripture because it’s that important to us.