I'm also tempted to add the work of Talal Asad to this list. Asad is a trained architect and anthropologist and writes very cogently about the genealogy of secularism. I have found it useful when trying to conceptualise places of the sacred and the secular.
In particular, Formations of the Secular: http://books.google.ie/books?id=CeJ85XwCPxQC&dq=asad&source=gbs_navlinks_s
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