I'm assuming that the case of the matter is that if such thing was said about joining socities, they didnt include GLO's. Otherwise, Theta Phi Alpha would be in a stitch, as it was originally founded on the morals of Catholic womanhood, although it has expanded to all religions now (I for one, am not catholic.)
I am not well informed about the free masons as one should be, but from my understandance, they were ridgedly anti-catholic. They were in fact.. anti anything that didnt fall into the "White Anglo-Saxon Presbyterian" area of things. This might be the reason that the pope had such qualms with them.
And truth be told.. I think that now, more then any time in history, we have freedom of religon. Final message:
No matter your religion, Go Greek!!