To find book reviews for books on various aspects of religion, start with these databases. You can limit your search to Book Reviews as the document type.
Christian Scholar's Review 1977 to present. A good source for book reviews on scholarly works.
Old Testament Abstracts and New Testament Abstracts: Each issue includes a Book Notices section which contains abstracts for recent publications.
Old Testament Abstracts 1978 to present
New Testament Abstracts 1977 to present