Muslim believe if cristian commit atrocities 100 years ago then ok for muslims to attrocty today? true/false?

False. This doesn't mean that they can't highlight the hypocrisy of people who think their atrocities (100 years ago? Seriously? What about Vietnam? What about Iraq? What about Afghanistan? What about Guantanamo? What about Bosnia? What about Rwanda? What about Chile, Argentina, Panama, Nicaragua, Guatemala, Colombia? Yeah, history can be a b*tch) are permissible, while everyone else's isn't. Besides, the saying about "him who cast the first stone" is christian, not muslim. Which makes you twice as hypocritical and bigoted.