Every religion has killed in the name of their God the Jews are no exceptions it was just a very long time ago the same applies to pretty much every other religion too including secularism. More people were killed in the name of secularism than in any other "religion". The NAZIS saw themselves as secular, Stalin saw himself as secular they just had an ersatz-religion. The muslims were once the leading thinkers, then came the osmanian empire which ended the golden age of islam pretty quickly and the 20th century islamic terrorism is also more revanchism for colonial times. The French weren't really nice to the muslims in Algeria and other places when they ruled.