(Talk about a tautology.)
I think he'd appreciate the assistance of allies who wanted to defend marriage. And that's what the conference was about: not denying doctrines, not merging un-mergeable faith communities on the basis of ambiguities and platitudes, but defending Marriage: which is a matter of Natural Law even before it is a matter of Canon Law.
A good man is not a perfect man; a good man is an honest man, faithful and unhesitatingly responsive to the voice of God in his life. - St. John Fisher
I guess you don’t care what Pope Pius XI said in Mortalium Animos that I have now posted at least two times.
These sorts of conventions or meetings CAN NOT be approved by Catholics. St John Fisher would not have approved this interreligious conference.