Yes, he got a bad rap for his very particular interpretation of the origin of Islam: in a nutshell, a couple decades in (after the death of the Prophet) the Arab conquests, the new Ruling class sought legitimacy through the fabrication of the whole story of the Divine task of the Prophet. OTOH, I haven't found a book that treats his thesis in its scope ever published. Jeffrey Stout has an unpublished project (you can watch the series lectures given in the 2017 Gifford Lectures), worked out a specific line of development and a different subject but out of the same premises. The other works of the role of Christianity that I know of are either bleak (no ambition nor new proposal forwarded) in the Vast encompassing history, or don't engage the historical aspect seriously altogether (for example, Nietzsche's genealogy is not historical in spirit, nor pretends to)

EDIT: found just that Larry Siedentop wrote "Inventing the Individual" which takes on the same job for accounting for the birth of the Individual and its avatars, by tracing it historically. But haven't read it,