Defining "murderer" as "one who causes the death of a human being, directly or indirectly" should be sufficient for this exercise. Under that criteria, who would your "usual suspect" be?

@Shawno1972 a soldier causes death of a human being, a policeman causes death of a human being in defense of another human being, indirectly I am sure I had caused death of human being while member of communications team in many military outfits land and sea. I am Sure you indirectly has caused Death of a human being Every time you paid your Taxes. So You Need to Do Better Than That Genius defining murder in your criteria and yes christianity is the Usual Suspect. The one and only and if you were Ever a christian you indirectly caused death of a human being.

@GipsyOfNewSpain I stand by my hard and fast definition, because it works for this exercise regardless. I agree with you, the usual suspect is Christianity, and more specifically Catholicism. I don't believe there's another religion (and that's the key word, religion - not culture, or nation, or other kind of group) that can hold a candle to the atrocities caused by Catholicism.

@Shawno1972 Correct about the "prostitute siting in the 7 hills. But your definition is pretty lame and not appropriate. At age 6 I indirectly was involved in the death of a junkie that attempted rape of the "help of my house", My grandmother, my 3 year old sister and me attacked him and in the process he lost an eye... was bitten, scratched, punctured by forks and scullery dull knives... eventually he escaped the house and was killed by a cop... he has a knife with him. And when told and ordered to he didn't dropped the weapon. I don't consider myself a murderer, neither my sister or my grandmother but we gave him hell on earth protecting a 16 year old girl working in the house until he ran away in bad shape. Hard and fast definition is a pretty bogus blanket that I reject its use in the question. You do can add us then because Just like the whole island was catholic, my house was catholic even if not in practice, everyone involved including the wanna be rapist was baptized and I am sure the cop was baptized too.

@GipsyOfNewSpain I don't think I was successful in getting my meaning across to you, because now it seems you've found affront where none was intended. I apologize for that and wish you well. Ciao, friend.

@Shawno1972And I salute you. Because what is murder to you may be doing my job to me. I deal with layers rather than absolutes. Church and religion deal with absolutes. Be careful who you make war to... most likely enemies end up being alike. I am not in war with church or god or religion. I don't want to end up like them. Back at ya!

Well, because of the Americas... christianity is way ahead of the islam then.

@GipsyOfNewSpain. AND...the inquisition, the witch burnings, and American Indian genocides come to mind. The Albeginsian crusades -ugh!

Vatican never been cheap.

Yep....lotsa bloodshed in China for hundreds of years.

Martin Luther wasn't a nice person. He believed any baby born with birth defects of any kind, even minor disabilities, was a spawn of Satan and should be drowned at birth. He was also a chronic farter who did it just to irritate others!

and inquisition.