A federal judge ruled last week that Boston City officials were justified in denying a religious group’s request to fly a Christian flag from a City flagpole. U.S. District Court Judge, Denise Casper, denied Harold Shurtleff’s request for a preliminary injunction that would force the City of Boston to fly a Christian flag from a pole at City Hall Plaza.

Camp Constitution, a Christian organization focused on studying the nation’s heritage, is threatening to file a lawsuit against the City if officials deny the group’s demand to fly a Christian...