Membership is for Craft Freemasons (recognized by the United Grand Lodge of England) who are also Holy Royal Arch Chapter Companions and who have a belief in the Trinitarian Christian Faith.

The Red Cross ceremonial is based upon the legend surrounding Constantine I, his conversion to the Christian Faith from paganism and his overseeing of the subsequent promotion of Christianity throughout the Roman Empire. This ceremonial is followed by that of the Order of the Holy Sepulchre which is based upon the actions of Godfrey de Bouillon following the fall of Jerusalem in 1099 A.D. in founding a corps of Christian Knights to protect the Holy Sepulchre against attacks by non-believers. The ceremonial of the Order of St John the Evangelist interprets the Royal Arch ceremony in Christian terms and completes the Appendant Orders ceremonies. Both Constantine himself, and his mother Saint Helena, a devout Christian, are particularly celebrated within the three combined Orders.