Search Gale e-books on your topic, and you'll find reference books that will provide background information on religious systems. (If you are in a dorm or off-campus, you will be asked to enter your Salve username and password in order to access these databases, immediately after you click on the link to access the database through the library website.)
Here are some general searches to try for specific faiths and their followers:
Agnosticism
Agnostics
Atheism
Atheists
Baha'i
Buddhism
Buddhists
Catholic Church
Catholics
Christianity
Christians
Confucianism
Confucianists
Hinduism
Hindus
Islam
Muslims
Jainism
Jains
Judaism
Jews
Protestantism
Protestants
Rationalism
Rationalists
Shinto
Shintoists
Sikhism
Sikhs
Taoism
Taoists
Zoroastrianism
Zoroastrians
If you want to browse the shelves, here are the call numbers that are used in religious and theological studies. Books with these call numbers are shelved on the third floor of the library in the Main Collection.
BJ - Ethics
BL - Religions. Mythology. Rationalism.
BM - Judaism
BP - Islam. Bahaism. Theosophy, etc.
BQ - Buddhism
BR - Christianity
BS - The Bible
BT - Doctrinal Theology
BV - Practical Theology
BX - Christian Denominations