Freemasons will go to Heaven if they’re good people, too - that is, if they follow the Commandments and abide by the Law, because they honestly can’t know any better. They have substituted a sort of ritualistic, statist Unitarianism for belief in Jesus Christ, but they’re in a state of what used to be referred to as “invincible ignorance.” So while it’s no blame to them, it would be blameful for a knowledgeable Catholic, especially a priest, to become a Mason.
Most US Masons have no idea what’s behind their group. Protestants never had any problem with Freemasonry, even though it’s technically atheistic or esoteric, but that’s because most of them were unaware of the deeper connections. They liked the ritual, which was missing in the Protestant churches, and also the all-male secrecy part of it. Most US Masons, I suspect, have always just regarded it as a social and benevolent club. So they’re not to blame, and the only people to blame are we Catholics because we haven’t made the message clear.
Some Protestant Christians have a problem with being Masons, others don’t. At least that’s what I’ve observed on the mason threads on FR.
Freegards