Disobeying the hierarchy is not nor ever could be a mortal sin. Masturbation and the contention that all sexual were mortal (the bishop who contended that does not know the meaning of the term venial, as in of Venus), missing Sunday and missing a word in saying the Mass. More important is the fact that before the Irish Sin Books were introduced, fewer things were considered mortal sin. Indeed, the concept of going to confession for them and saying a few prayers to have them removed was a development, as was the fetishization of being in a state of grace for Communion. That does not happen now either and it is a welcome change. No fetish is healthy. In a few decades, no one will remember the Church of the Holy Fetish.