Religion

While the main Quest for Glory series does not generally make direct references to real world religions (other than some holidays such as Christmas, and more obvious reference to classical era Greek, and Egyptian religions/afterlives/gods) some allusions do appear in the series.

Christianity

Somewhat vague, there is a reference to Christmas (aka Christ's Mass) in QFG1. This is the holiday that celebrates the birth of Christ, but is also secularized as well. Christ being the Son of God. Christ and God being two parts of the Godhead, along with the holy spirit, that make up trinitarian beliefs. The use of the classic historical terms such as BC as seen in Quest for Glory, is also a reference to the period "Before Christ".

There are some crosses in the cemeteries. The Devil appears in the Tarot deck in QFG4.

There is a generic reference to a monotheistic style God mentioned by Ali Fakir in QFG2, though this may be more of a reference towards other Abrahamic traditions such as Islam, see below.

The Quest for Glory: The Authorized Strategy Guide and certain references of Quest for Glory V, make reference to a more traditional Christian inspired Hell, as one of the afterlives in the universe. The Hero prevents demons from escaping from there.

The Monastery in QFG4 is vaguely Catholic or Greek Orthodox in style, but obviously been warped by the followers of Avoozl, an H.P. Lovecraft inspired religion, see below.

Islam

Allah is mentioned by Ad Avis in Hoyle 3. This is obviously a reference to the god of Islam. See Ad Avis quotes (Hoyle 3).

In Arabic language and Islamic cultures Allah is the name for the "God" of Abrahamic traditions (although certain aspects of this God vary by religion, such that for example, in Islam, Christ is another prophet (a mere man), rather than the Son of God, and Allah has no son, and there is no 'trinity'). In QFG2, the concept of a mono-theistic "God" in beliefs of Shapeir, is mentioned at least once, specifically by Ali Fakir (but this is perhaps the limits to understanding Shapeir's religious culture within the game).

There are a number of things mentioned in Quest For Glory II and Quest for Glory III that are taken from or inspired by Islamic ideas. These include the Houris of Paradise, the idea of 'Infidels', certain aspects of the backstory of Julanar (concerning the treatment of women in her time), and some of the characters in QFG2 are inspired by the names of famous leaders of Islamic caliphates, emirates, and sultanates. The evil Marid Iblis takes its name from, and is more or less inspired by Islam's version of the Devil/Satan (though in QFG, Iblis and Shaitan treated as seperate entities).

Many of the rules for women that Ad Avis instituted in Raseir such as "forbidding a man to speak to a woman unless she is his mother, daughter, or wife" or "mother, wife, or slave" are based on Islamic Sharia practices.

Only Hoyle 3 makes reference to Allah (God) having a Prophet, a reference to the Islamic Prophet, Muḥammad.

Suleiman bin Daoud is the name of the Jewish-Israeli King Solomon ben David, in the Bible and the Qur'an. According to apocryphal, rabbinical and magical literature and legends, this figure had power over good and evil spirits. These occult traditions of course are not compatible with the Bible, but the Qur'an mentions that he had power over the djinn.

Buddhism

Extremely minor reference to Bhuddha and the sacred fig tree, 'Bodhi Tree' in QFG1VGA, when randomly looking at trees. There are reference to Zen (as from Mahayana Buddhism in references in QFG1VGA, and QFG3.)

New Age

New Age ideas mixed with 1960's Hippy subculture are represented by the character Salim Nafs. A number of his books make reference to New Age concepts, and a mix of Eastern religion, see also Buddhism above. These include such things as astral-projection.

Egyptian Mythology

Represented by Anubis and Sekhmet, and the Egyptian afterlife of Tu-at.

Notes

A reference in QFG4, inside of a book on thieves and traps. It states "In the section on surviving magical traps, the book suggests taking up religion."