A Christian militia beheads a Muslim Man in CAR: how come this beheading is not front page news?

"Christian militiamen decapitated a young Muslim man in the capital, Bangui,".  I realized that beheading is not a big news story if the victim is a Muslim.  I remember when Zarqawi resorted to such heinous methods how many commentators wrote about: what is it about Islam that permits beheading?  So let me ask: what is it about Christianity that allows beheading?