If you think the Roman empire didn't have slavery or pronounced and flagrant barbarism, I don't even know what to say. Is this based on any actual statistics and documentation of culture changes, or just your 'impressions'?
During the Golden Age of Islam it was much more tolerant and altruistic than Christianity during those years. You are twisting history to fit your bigotry.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.