Seems like a crackpot conspiracy theory site to me. I could be wrong, though.
Bingo.
My wife's grandfather was a mason. And a member of the United Church of Christ. His masonic lodge buddies had a small memorial service before the funeral to which the family was invited. I had grown up hearing all sorts of innuendo, mumbo jumbo and hocus pocus about the Masons, so I was worried there would be some sort of nonsense or heresy.
Nothing of the kind. They put an apron on the corpse because it represented his service to God and humanity. And because, the Masonic leader said, "as he is covered by this apron, we recognize that his sins are covered by the blood of Jesus Christ".
Sounded pretty Biblical to me, actually.
Now, if the Masons are devil worshipers, they've done a bloody good job of hiding it. And while I wouldn't join, I wouldn't hesistate to donate money to one of their projects to help disabled children. They do great work.
The Catholic Church teaches that when one is redeemed, in a state of grace, one's sins are expunged, not merely covered. That is one incompatibility with Church teaching and Masonry.
In other words, the faithful are prohibited from joining it, just as they are prohibited joining other organizations with stark doctrinal differences.