Qabalah, (also spelled Qabala, Qaballa, Qaballah, Qabbala, Qabbalah, Qabballa, Qabballah, and various spellings starting with the letter C and K): A Jewish mystical tradition. See: Cabbalah.

Qadi: A Muslim term for a judge who is competent in Shari'ah law.

Qibla: This is an Islamic term for the direction from the Muslim's current position on earth to the Kabbah in Mecca, Saudi Arabia. This is computed along the shorter of the two great circle routes between the Muslim's current position and the Kabbah. Muslims are expected to pray five times a day with facing Qibla. A Windows program for calculating Qibla ₁  and a mathematical formula  ₂ is available.

Quaker: The informal name for the Society of Friends faith group.

Quartodecimanism: The celebration of Easter on the fourteenth of Nisan according to the Jewish lunar calendar -- regardless of what day of the week on which it occurred. The Council of Nicea in 325 CE decided to observe the crucifixion on a Friday and the resurrection on the following Sunday.

Queer: Originally a derogatory term, "Queer" is now used by LGBT (lesbian, gay, bisexual and transgender persons) to identify themselves.

Quest for the Historical Jesus: This is a series of attempts over the last few centuries to analyze the books in the Christian Scriptures (New Testament) and other historical writings of the early Christian movement in order to get a greater understanding of the birth, life, personality, religion and teachings of Yeshua of Nazareth. Inherent in this search is a rejection of the beliefs that God inspired the authors of the Christian Scriptures and that their writings are inerrant. The quest is mainly an activity of religious liberals and non-theists.

Qur'an:  The name of the holy book, inspired by God, that Muslims, (followers of Islam) believe to be inerrant. An alternative, but less desirable spelling is "Koran."