Edit - I'll add that not ALL Free Mason's worship Lucifer knowingly, but once they advance up the degrees to the 33rd Degree, it starts to become obvious. Not all of them make it to that level, so it's an evil organization that is hidden within a larger body that has a good outward appearance. The system itself weeds out those who can't handle the truth about what they're about.
This is a long video, but the content is intense. If you can stick with it, it'll make more sense why the Free Mason's worship Lucifer.
https://www.youtube.com/watch?v=cN0k7cpFU3Y
Edit - I'll add that not ALL Free Mason's worship Lucifer knowingly, but once they advance up the degrees to the 33rd Degree, it starts to become obvious. Not all of them make it to that level, so it's an evil organization that is hidden within a larger body that has a good outward appearance. The system itself weeds out those who can't handle the truth about what they're about.