Books on the topic of Religion can be found in the BL, BM, BP, BQ, BR, BS, BT, BV, BX sections of the library stacks.
Remember you might have to look at other areas depending on your topic (example, if you topic is about education then you might look in the education/teaching section).
Find Books using Library Catalog, the catalog under the left menu, and the catalog link on the top of the page. (Login using your TTC login.)