BL - Religions. Mythology. Rationalism.
Philosophy of Religion
Natural Theology
Hinduism
Jainism
Various Semitic, African, and other religions
BM - Judaism
BP - Islam. Bahaism. Theosophy.
BQ - Buddhism
BR - Christianity
BS - The Bible
BT - Doctrinal Theology
BV - Practical Theology
BX - Christian Denominations