precisely because of the “Infallible Door” that you do not want to open, yet is a point at the heart of your false claim.
I also had 16 yrs of Catholic education (and 10 more in secular education). I learned most of the Catholic faith from home and from later in life. Many Catholic schools aren’t really that (#jesuitslookingattheirfeetuncomfortably).
Popes have differed on nondoctrinal issues, but not doctrinal ones…..such as that abortion is a mortal sin that is the killing of a living human being.