The collection contains volumes on most religions. [Including those the general public has no idea about.]

The first book there touches upon the basics and principles that most religions follow, although it focuses more on Christianity than others. The second is all about symbolism across various faiths, not specializing in any in particular. The third book touches briefly on the most commonly seen religions, giving a bit of history and other useful tidbits. [It also happens to be the thickest.]

If you'd like something that focuses on a particular religion however, I'd be glad to fetch something for you.