The Freemasons today may be obsolete as a revolutionary political force (note Philippe Egalite’s comparison of Freemasonry to a candle and revolution to the sun), but the primary reason Catholics cannot be Freemasons is theological. Freemasonry, despite what its members might claim, makes definite theological assertions that are incompatible with Christianity, and specifically, Catholicism.

[0] https://www.ewtn.com/catholicism/library/what-are-the-masons...