Jonathan P. Berkey was commonly known for his book, The Formation of Islam. Berkey's argument was that Islam did not appear as a fully-formed faith, but developed through conversation and study with other religions.
Through thorough study of the religious scene in the Near Eas, he was able to know Islam's first century.
He was able to trace the start of new forms of Islam in the middle period as a result of thorough study of other religion.
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