Neither John Vennari nor the SSPX has anything to do with a Pope who invoked a Saint to protect Islam.
May I suggest the Old or Utrecht "Catholics" who are a 19th Century schism still active today which keeps most of the outward appearances of Catholicism including Tridentine everything, rejects papal infallibility in matters of faith and morals (under the usual conditions) as you seem to, recognizes IIRC no pope elected after Pius IX (which does present a problem for you as to Pope Saint Pius X although I have confidence that you can get over that one) and, of course, names and consecrates its own bishops beginning with their rebellion against the First Vatican Council's definition of the doctrine of infallibility.
Of course, John Vennari of "Catholic" Family News has nothing to do with Saint John Paul II who excommunicated his schismatic heroes. Ditto SSPX which IS the schism in question. Of course, Vennari has never been pope. Nor has anyone associated with the SSPX schism ever been pope or ever will be without renouncing the schism and, as they say, all of its works and all of its pomps, etc.
Finally, "a pope who invoked a saint." That would apparently be a pope who has been canonized as a saint. Dogma is dogma. Doctrine is doctrine. The Church, however, is more than a mere museum.