I know several brothers who are. There is nothing in Freemasonry that says if you belong to XX religion, you can't join. The only religious prerequisite is you just must believe in one God (monotheistic). I believe the 'anti-mason' writings it commented on were more political, the old anti-mason party. (http://en.wikipedia.org/wiki/Anti-Masonic_Party)
That's what I was told over 30 years ago, "If you don't believe in God, you cannot become a Mason". Many think of Masonry as a religion, it is not, it is not a cult, it is more of a fraternal organization than anything. I've never seen anything that could remotely be called "worship" in a Masonic Lodge, even though the leader of a lodge is referred to as "worshipful master", nobody worships him, it's a title, he's just "Joe Regularguy" who lives down the street and next year there will be a new "master".
Parts of the L.D.S. rituals were stolen by Joseph Smith straight from the Masons.
That's what I was told when I joined more than 30 years ago and contrary to what some believe free masonry doesn't pretend to be a religion.