Is the Rainbow flag the Official Flag of Left-Wing Christendom

Camp Constitution has a pending lawsuit against the City of Boston for denying us a permit to fly the Christian flag on a public access flagpole at City Hall Plaza.  The City gladly raises the Rainbow flag on City Hall Plaza and pastes its main library with Rainbow flags.  Last year, I visited a number of left-wing churches  to make the case that the Rainbow flag is the official flag of left-wing Christendom.