That’s like asking if a plaster Virgin Mary best expresses your integrated philosophical foundation including morality and politics. If not, I think the offence to me would be greater if I thought the SP moment had enough truth in it to be offensive, wanted to build up its symbolism and focus on my victimization.
Spicing up an episode with multiple irreverent absurdities is integral to SP's appeal for many, perhaps for a similar group that’s potentially attracted to Catholicism by miracles from fluid dripping status. SP lampoons questionable aspects of Catholic methods, but you want to outlaw theirs.
A Statue of Virgin Mary is not the entire expression of Catholicism, but it is important. as she is the high point of purely human acheivement, to which a Catholic is called to strive.
As to South Park appeal, pornography is even more appealing, but it does not make it valuable or justifies its political legality.