Please correct your information, islam was not formed 1500 centuries before, it is the religion which came into existance since man step his foot on earth. If you really got guts then please open the closed books, we want to know what is there in the closed books, so that we can clear the misconception. before ending i would like to say a phrase mentioned in our Holy book "Quran" "Whosoever kills a human being without (any reason like) man slaughter, or corruption on earth, it is as though he had killed all mankind... (5:32)
Do not kill a soul which Allah has made sacred except through the due process of law (6:151)