One in four is Muslim, study says

You know what is pathetic? you not anwsering my question :)

If you compare the murders/death committed by:

Islamists
USA/West
Communistss
Nazi's

Then who commited the most last 100 years?
last 200 years even? last 300 years even?
last 400 years even?
lastt 500 years if you want????