Why do discussions of Tours (or Poitiers) always morph into debates of the relative merits of Muslim versus Christian values during the Middle Ages?

ARGH! It's a great read and for a reason nobody has even touched yet... It showed that given the right terrain, an army that was largely infantry could in fact defeat a numerically superior force of light cavalry and horse-archers. I find that aspect of Tours (or Poitiers) fascinating.... in game turns... imagine taking on the Golden Horde with feudal swordsmen and milita sergeants.