No. While it is a requirement that each member believe in a Supreme Being, it is not important how one expresses that very personal belief. Further, there is no dogmatic system in Freemasonry. Confusion about the secular nature of Freemasonry, however, has been a common misconception for many years. Most likely, this misconception is due to the Holy Book that sits on the altar in the middle of a Masonic lodge. This Holy Book does not have to be Christian, like the Bible, rather it can be any Holy Book that is important to the members of the lodge. In the US, where the population is mostly Christian, the Holy Book most often used in Lodges is the King James Version of the Bible.