AHC: Subsaharan religion widely practiced throughout Mediterranean

How could a religion originating below the Sahara become widely practiced north of it?

Bonus points if African art influences the religious symbols of that religion.
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Well, first of all you need to have an organized proselytizing religion develop, IOTL Traditional African religions are a mixture of regional beliefs passed down orally and a few semi-organized religions in small regions.
If a monotheistic faith were to pop up in West Africa, what polytheistic god would it be based off of?