There are countless factors that contribute to the success of the Islamic empire in spreading monotheism. Many advancements in science, architeture, literature, and mathematics are due to the influence of Islam. The Arabs where tradesmen. The Prophet Muhammad met his wife as a result of a business agreement. As tradesmen, Arabians traveled through out the land, from North Africa the middle east, even as far as central asia. Another contribution that led to the success of the Islamic empire was the Arabic language being a universal form of communication. The Deen or, “Way of life” became just that. Not totally by force but moreso as a result of cultural influence.
Two similarities between Islam and Christianity are the belief in only one God, and they both believe in an Afterlife. That once this life is over, one is promised with Heaven or Hell, according to one’s deeds. Also, The Bible and The Holy Qu’ran speak of the same people. Abraham, Moses, Soloman, Mary and Jesus.
Yes religion played a role in the success of the empire because of the huge cultural influence. Islamic culture was a part of everything from trade to education. One of the oldest universities is the Sankore University in Timbuktu. This university was estabished under the rule of Mansa Musa, who was an African King famous for his pilgrimage from west Africa to Mecca. He gave away so much gold that it changed the economy. It is said that he is still the richest man to have ever lived. And yes, Mansa Musa was muslim.