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This is a list of good books that pertain mostly to spirituality. Feel free to add to the list; and I will make additions to the list, as I deem necessary.

Christianity:
-The Holy Bible
-The Chronicles of Narnia - C.S. Lewis
-The Great Divorce - C.S. Lewis
-Pilgrim's Regress - C.S. Lewis
-The Space Trilogy - C.S. Lewis
-The Lord of the Rings (whole trilogy) - J.R.R. Tolkien
-Narcissus and Goldmund - Hermann Hesse
-The Journey to the East - Hermann Hesse
-Magister Ludi - Hermann Hesse
-Paradise Lost - John Milton
-Divine Comedy - Dante Alighieri
(-The Inferno - Dante Alighieri)
(-Purgatorio - Dante Alighieri)
(-Paradisio - Dante Alighieri)
The three parts to the Divine Comedy-The Will of God - Leslie Wetherhead
Catholicism:
-New American Bible
-The Dolorous Passion of Our Lord Jesus Christ(Also called The Passion of Christ or The Dolorous Passion of the Christ) - Anne Catherine Emmerich

-Galileo Galilei - Bertolt Brecht
-Malleus Maleficarum - James Sprenger and Heinrich Kramer
-The Crucible - Arthur Miller

The Church of Latter Day Saints:
-The Book of Mormon
-Doctrine and Covenants
-Pearl of Great Price

Christian Mysticism:
-Anna Karenina - Leo Tolstoy
-God Sees the Truth but Waits - Leo Tolstoy
-Phantastes - George MacDonald
-Lilith - George MacDonald
-At the Back of the North Wind - George MacDonald
-Saviors of God - Nikos Kazantzakis
-The Greek Passion - Nikos Kazantzakis
-Seeds of COntemplation - Thomas Merton
-The Seven Story Mountain - Thomas Merton

Islam:
-The Qu'ran

Theosophism:
-Phantastes - George MacDonald
-Lilith - George MacDonald
-At the Back of the North Wind - George MacDonald

Spirituality (general):
-Celestine Prophecy - James Redfield (I think)

Occultism:
-The Greater Key of Solomon - Samuel Liddell Mathers
-3 books of Occult Philosophy - Agrippa
Alchemy:
-Alchemy: Ancient and Modern - Herbert Stanley Redgrove
-Alchemy Key - Stuart Nettleton
-The Golden Dawn Schem ha-Mephoresh (All three of these alchemy books can be found at http://www.hermetics.org/ebooks.html )
Golden Dawn:
-The Essential Golden Dawn - Chic and Sandra Cicero
-The Golden Dawn - Israel Regardie
-What You Should Know About The Golden Dawn (formerly titled My Rosicrucsian Adventure) - Israel Regardie
-The Complete Golden Dawn System of Magick - Isreal Regardie

Paganism (different branches are numbered):
1. Wicca:
-The Wicca Handbook - Eileen Holland
-Complete Book of Witchcraft - Raymond Buckland
-Wicca: A Guide for the Solitary Practitioner - Scott Cunningham
-Witchcraft Today - Gerald Gardner
-The Witches bible - Farrars
-The Wiccan book of Ceremonies and Rituals - Patricia Telesco
2. Druidism:
-I had some, but apparently, I cannot find any right now.
3. Ancient European Paganism:
-The Golden Bough - Sir James George Frazer
4. Greek:
-Til We Have Faces - C.S. Lewis
5. Shamanism:
-The Way of the Shaman - Michael Harner
-Mind Games - Masters and Houston
6. Ancient Paganism:
Mythology - Edith Hamilton
7. General NeoPaganism:
Aradia: Gospel of the Witches - Charles G. Leland - This entire book can be found online here:http://www.paganlibrary.com/etext/aradia/index.php
-Drawing Down the Moon - Margot Adler
-The Witch Cult in Western Europe - Margret Alice Murray - The entire book can be found online here: http://www.sacred-texts.com/pag/wcwe/index.htm
8. Discordianism/Erisianism (Note: most Discordian books can only be found online, though printed versions of certain books do exist):
-Principia Discordia - Malaclypse the Younger - The entire text can be found here: http://www.principiadiscordia.com/book/1.php
9. Native American Spirituality (Shamanism):
Good Medicine (series) - Adolf Hungry Wolf (out of print)

Satanism:
Church of Satan:
-The Satanic Bible - Anton Szandor LaVey
-The Satanic Rituals - Anton Szandor LaVey
-The Devil's Notebook - Anton Szandor Lavey
-The Satanic Witch - Anton Szandor Lavey, Peggy Nadramia
-Satan Speaks! - Anton Szandor LA Vey
-Secret Life of a Satanist: The Authorized Biography of Anton Lavey - Blanche Barton

General Philosophy:
-Discourse on the Method and Meditations - Rene Descartes
-Goethe on Science - Jeremy Naydler (editor) Goethe
-True to Life (?) - Micheal Lynch (Analytic philosophical work on what truth is, and why we seek it).
-There are Two Errors in the Title of this Book - Robert M. Martin
-The Great Insturation & New Atlantis - Francis Bacon
-The Republic - Plato
-Candide - Voltaire
-Praise of Folly - Desidarius Erasmus
-The Problems of Philosophy - Bertrand Russell
-Three Dialogues between Hylas and Philonous - George Berkeley
-On Bullshit - Harry Frankfurt (Analytic Philosophical paper defining what Bullshit is; can be found here
-The Myth of Sisyphus - Albert Camus
-The Rebel - Albert Camus

Origin of Life:
-Symbiotic Planet - Lynn Margulis (very biological)
-Genesis (First Book of the Bible)

Jewish Kabbalah:
-The Middle Pillar - Isreal Regardie
-The Tree of Life - Israel Regardie
Sepher Yetirah:
-The Sepher Yetzirah - Wm. Wynn Westcott
Sefar ha-Zohar:
-Kabbalah Unveiled - S. L.MacGregor Mathers

Hinduism:
Jain:
-Satyagraha - Mohandas Gandhi
-My Experiments with Truth - Mohandas Gandhi

Buddhism:
-Narcissus and Goldmund - Hermann Hesse
-The Journey to the East - Hermann Hesse
-Magister Ludi - Hermann Hesse
-Siddartha - Hermann Hesse
-Mindfulness in the Marketplace - Various Authors

Religion and how it affects Society and Vice Versa:
-Beyound Belief - Robert N. Bellah
-The Broken Covanent - Robert N. Bellah
-Varieties of Civil Religion - Robert N. Bellah

Religious Tolerance:
-Nathan the Wise - Lessing

-Black Boy - Richard Wright

Books to Stay Away From
-The 21 Lessons of Merlyn - Douglas Monroe - A book that is an apparent attempt to teach the basics of Druidism, yet has been proven by real druids and religious scholars to be completley inaccurate, both in a historical sense and a spiritual sense.
-The Lost Books of Merlyn - Douglas Monroe - The sequel to the previously mentioned book, and has collections of spells, most of which are too incomplete to be put to any use.
-Most books on wicca or paganism by Silver Ravenwolf, they are largely fluffy books, with facts that are not very correct.

A section for Mormonism needs to be added, and the first entries under it should be "the Book of Mormon", and two other Holy Texts, whose name escapes me but I will look up and get back to you on. Also, a section on cults/New Religious Movements/Non-Mainstream religions should also be added.

Both authors were greatly influenced by christianity, and so too were many of their works; especially the ones listed.

Burning times, is kind of a misnomer. I mean, most of the accused from that time period where hanged, not burned.

I know, but, when you think about it, it's kind of funny, how it's called the burning times, and here the accused were hanged moreso than burned at the stake. You think the Historians would have gotten it right...

I have a bunch more for you (listed in order of relevance by religion):

Christianity
Catholocism
The Dolorous Passion of Our Lord Jesus Christ (Also called The Passion of Christ or The Dolorous Passion of the Christ) by Anne Catherine Emmerich - Accounts of 66 visions recieved by a nun about Christ's last week on earth. Note: All details and scenes not found in the bible in Mel Gibson's Passion movie were taken directly from these visions.
Church of Latterday Saints
The Book of Mormon

Islam
The Qu'ran

Occultism
The Greater Key of Solomon translated by Samuel Liddell Mathers - An important manuscript that lays down the groundwork for modern Ceremonial Magic.

Paganism
Ancient Paganism
Mythology by Edith Hamilton - One of the best and most complete books of ancient Greek myths.
General NeoPaganism
Aradia: Gospel of the Witches by Charles G. Leland - A series of legends and teachings supposedly passed down through generations by Itallian witches and published in 1899. This entire book can be found online here: http://www.paganlibrary.com/etext/aradia/index.php
Drawing Down the Moon by Margot Adler - A seven year study of modern paganism in America.
The Witch Cult in Western Europe by Margret Alice Murray - A book written in the early 1900s theorizing about the existance of witches. The entire book can be found online here: http://www.sacred-texts.com/pag/wcwe/index.htm
Discordianism/Erisianism (Note: most Discordian books can only be found online, though printed versions of certain books do exist)
Principia Discordia by Malaclypse the Younger - The founding text of the Discordian religion. The entire text can be found here: http://www.principiadiscordia.com/book/1.php
Wicca
Complete Book of Witchcraft by Raymond Buckland - A complete guide to everything you'll ever want to know about Wicca.
Wicca: A Guide for the Solitary Practitioner by Scott Cunningham - A very good introduction to Wicca

Native American Spirituality (Shamanism)
Good Medicine (series) by Adolf Hungry Wolf (out of print) - This series covers all aspects of life as a Native American, and focuses on the spiritual aspects of living in harmony with nature.

Satanism
Church of Satan
The Satanic Bible by Anton Szandor LaVey - Sets forth the founding ideals of the CoS.
The Satanic Rituals by Anton Szandor LaVey - Contains more theory on magic and Satanism, and contains several spells and rituals.

Books that I personally feel you should stay away from:
The 21 Lessons of Merlyn by Douglas Monroe - A book that is an apparent attempt to teach the basics of Druidism, yet has been proven by real druids and religious scholars to be completley inaccurate, both in a historical sense and a spiritual sense.
The Lost Books of Merlyn by Douglas Monroe - The sequel to the previously mentioned book, and has collections of spells, most of which are too incomplete to be put to any use.

And one more thing... The section "Golden Dawn" most properly belongs under the category "Occultism." It contains elements of many religions and actually has more to do with Jewish mysticism than it does with Paganism.

My bad.

Actually, Tolkien, the author, was a very devout Catholic. He was a very conservative man who never let himself indulge in anything that might be seen as sinful. He attended church almost daily.

Lord of the Rings has evil sorcerers in it, and in the end, good triumphs. The bible has stories of sorcerers in it, and in the end, good triumphs. I honestly don't see how these people can discredit something just because it uses the word "magic," when it's found in their own bible.