The late friar, Massepelosse, of good memory, a true zealous man, or else I give myself to the devil, of our religion,
I believe this is important to understanding the author and his stances. Rabelais has backgrounds in religion and is able to see the darker side to more typically claimed moral correct institutions. Anne-Pascale Pouey-Mounou mentions something similar as "Rabelais is both squarely in the camp of anti-ecclesiastical polemic and interested in the new ideas: the return to a biblical message cleansed of its scholastic glosses, and the condemnation of formalism, of the Church’s corruption and its persecutions. One can venture that Rabelais knew what he was talking about when he criticized the Church: he had been a Franciscan friar at Fontenay-le-Comte (who left his Observant congregation after his Greek books were confiscated " The point of satire usually is to call out the multiple sides to social norms and the trickster is typically a great tool where even villains before being defeated usually make very valid points in criticism of the norm and are usually only villainized because of their response to social inadequacy. The last part of "i give myself to the devil, of our religion" which is a small jab at the monotheism and acknowledges other religions which also was controversial for its time period and the way the Church treated polytheism.
Pouey-Mounou, Anne-Pascale. “3.” A Companion to François Rabelais, pp. 75–75.