Belief in God can be a dangerous thing, especially for those that don’t believe!
Need an example? Imagine the early 1200’s, the Church is very very powerful and Pope Innocent III reins (apparently reluctantly over all of europe), except he has a little trouble with the heretic ‘Albigenses’ (http://www.newadvent.org/cathen/01267e.htm) known to some as the ‘kathos’ I believe. The kathos live in Southern France and after they murder someone important to the Pope, he resorts to force in true religous style.
However, the French catholics in one particular part of france, side with the Kathos in an unprecedented move and they all shelter together in the church of Mary Magdeleine. Pope Innocent III, a magnificent ruler of The Holy Land, as described by the catholic encyclopedia, when questioned on how they should seperate the catholics from the heretic ‘kathos’ the Pope replied: