In Little-Changing Greek Orthodox Church, a Celebration of a Cathedral’s Centennial By Bill Broadway Washington Post Staff Writer Saturday, November 27, 2004; Page B07 2004 is but a blip on the timeline of Orthodox Christianity, which traces its beginnings to the apostles, its unification to the Roman Emperor Constantine in the 4th century and its liturgy to St. John Chrysostom 200 years later. As it happens, this year marks the 100th anniversary of the Washington