Stephen Headley & David Parkin 
Islamic Prayer Across the Indian Ocean [PDF ebook] 
Inside and Outside the Mosque

In its attempt to squash the influence of animism and pantheism or polytheism and to promote the idea of the One and Only Absolute God, Islam has come up against a tendency within itself to incorporate certain local religious traditions and practices. This book shares that combination of universality and local particularity, exploring this paradox and the contradictory tendencies contained in it.