Yes, and freemasonry does represent a serious departure from Christian belief. It is a bit of cognitive dissonance for me to think of the founders in that light. I think some, perhaps most, were members on the edges, not insiders actively working against the Gospel, just not well informed. Southern Baptists frequently have such ties, and they are good people, but members of freemasons out of tradition, or sometimes professional necessity, without ever having considered the spiritual conflict such dual membership represents.
Hate to break it to you, but George Washington was a leading Freemason and the master (or whatever they call it) of his local fraternity multiple times.