Actually, they really had good writers who seemed quite knowledgeable about history. The Oliver Cromwell song or Decomposing Composers or the ditty about all the drunken philosophers, and the tune about the galaxy (all of these songs btw committed to memory and trotted out to regale me on long car trips by my seventeen year old) are quite informative, historically accurate and funny. V's wife.
Actually, they really had good writers who seemed quite knowledgeable about history. Their references to historical figures and incidents have always struck me as so much name-dropping, displaying little or no in-depth knowledge.
Take "Decomposing Composers," or the Philosopher Song; you say that they are historically accurate. Well, Plato was a philosopher, and Beethoven is dead, but apart from that, what are they accurate about?
As for "Oliver Cromwell," it's lyrics indicate nothing more than that one of them could read an encyclopedia article, which, given that most of them went to Cambridge, is not overly impressive.
While I certainly enjoy much of Monty Python's comedy (please note the handle) they are not exactly experts on History. They were certainly intelligent and well educated however most of what they knew of the Crusades and Inquisition comes from English Reformation agiprop against the Catholics and was mixed their generally irreverent attitude towards all religion. Hardly a good mix for any Christian to take seriously.