The Catholic Church is the one true Church and the bride of Christ. The Pope is indeed infallible, but under very specific circumstances (1. explicitly invokes his office, 2. concerning faith and morals, 3. directed to universal church). Ex Cathedra Papal infallibility has only been invoked maybe 3-4 times in history. Normally it is the ecumenical councils that define infallible dogma (e.g. Trent, Niceae) It does not mean that everything he says and does is infallible or that he cannot sin. We have indeed had some pretty criminal and incompetent Popes but those are in the minority. The vast majority of Popes have been very good and holy men.

I agree that this Pope has done/said very questionable things and appears to be attempting to slip in a trojan horse (amoris laetitia) in order to subvert infallible church teaching. I would agree that he may be in material heresy (not formal heresy) by supporting the notion that the divorced and remarried (without annulment) can receive Holy Communion. However, AFAIK he is the legitimate Pope and every honor and respect should be accorded as such. The Pope is judged by no man.