Western Rite Orthodoxy is a larp. The Roman Catholic Church and arguably the Church of England and some Nordic Lutheran Churches and some Old Catholic Churchs, but mostly the Roman Catholic Church, is the true continuation of the great Western Church.

Most Eastern Catholic Churches though are legitimately historical Churches. Some might be kinda larps though like the Ethiopian Catholic Church, BUT there are legitimately historical Churches that are Eastern rite in the Byzantine and Syriac rites of the Catholic Church. They are genuine continuations of parts of the great Eastern Church.

Byzantine Lutheranism is kinda somewhat of a LARP but Lutherans have had some historic ties to Eastern European lands.