How did islamic culture and religion spread so quickly? (two ways)

 one reason is that Arab armies were united by their beliefs.Islam taught that Muslim warriors who died in the service of Islam would win a place in paradise.the idea of jihad also motivated many Muslim soldiers.the lure of riches to be won in the conquered lands was another powerful incentive.  and answer 2 Islam was both a religion and a political entity. While the religion was not
often spread by "Convert or Die" pronouncements (such as was the case in  Christendom), Islam as a political entity was spread by armies and warfare. In general, the following reasons account for the spread of Islam both politically.and religiously hope this helps:)

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