I was wondering if a baptised non-catholic commits a mortal. But doesn’t know at the time that it was one. And then a long time afterwards realize it was, then becomes a catholic. if that person would have to confess that sin.
I mean if they didn’t know at the time it was a mortal sin (and then would have very well avoided it) would they still have to confess it? (Especially if they were not catholic, or religious).