Because it is your dogma, that why. From my neutral point of view, Islam is nothing more worth than Buddism, Taoism, Christianisim or whatever Religions.
There is no 'superior' Religion on this planet !
TELL ME THE DIFFRENCE BETWEEN ISLAM AND THE REST OF THE RELIGIOUN? ISLAM IS THE ONLY DEEN NOT TO HAVE CHANGED SINCE IT HAS BEGAN ALL THE OTHER RELIGIOUN HAS ALTERTED THEIR "HOLY" BOOK