Everyone has their imaginary stories, from UFO's to Big Foot. Religion is no different. Every religion has come down to us with man made ideas, including Islam. Traditions, Sunnah, hadith and 'history' are all tainted by the hand of man which has resulted in a religion that can say killing an innocent life is like killing the whole of humanity and at the same time declare every none muslim a kafir, infidel, so not 'innocent' and is fair game for beheading or bombing.
The difference between them all is the Quran, a preserved Book that has been proved to have been written down at the time of the Messenger so there can be no doubt that it is what he left us. When we judge from this book, as opposed to the adulterated ones of Christianity, Hinduism etc or the unethical/immoral lack of belief of atheism, we can see the 'innocents are sacred' and reject the 'everyone are walking dead'.
Childish imagination makes way for adult intellectual thought, reflection, which leads to an understanding of right and wrong, amongst a host of other things.