The Library of Congress Call Numbers for Religion are concentrated in the "B" section. Books are shelved by subject, so it can be useful to go to the general call number area you are interested in and browse the shelves in that area to locate books on your topic.
The "B" classification is divided into the following areas:
BJ-Ethics (see also R724-725-Medical Ethics, Bioethics)
BP-Islam, Baha'i, Theosophy
BR195 W6-History of the Early Church-Women
BS701-1830-Old Testament (divided by book)
BS1901-2970-New Testament (divided by book)
A more complete list can be found at The Library of Congress.
All of these call numbers are located on Wilson 1.