One of the strengths of islam, which made it successful in universalizing religion similar to christianity, was its

The strength of Islam is that they believe in insistence that there was only one God. . The status of Mecca was enhanced by its merchant’s control of trade throughout the Middle East. The Umayyad concept is supported the theological and political and with Islam. 

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.