"RC Liberals" -- that seems to be a contradiction in terms when it comes to faith. The Roman Catholic path is very straight and very narrow.
Liberals like paths that are winding, wide and eclectic and very forgiving. That way there is no reason for the Sacrament of Reconciliations because nothing is wrong or evil. It's also very easy.
To me, being liberal means that almost "anything goes."
I don't think that any Christian, Catholic or any of the 40,000 different Protestant denominations, believe that.
FYI: http://www.city-data.com/forum/christianity/1938892-33000-41000-how-many-protestant-denominations.html
Why not just man up and realize that their are milions of individuals that disagree with aspects of the catholic church.
Either that, or just quit trying to make it sound that you are trying to be conciliatory to any protestant.