Comparative religion is that branch of the study of religions concerned with the systematic comparison of the doctrines and practices of the worlds religions. There are many benefits to such a course of enquiry but in general the comparative study of religion yields a deeper understanding of the fundamental philosophical concerns of religion such as ethics, metaphysics and the nature and form of salvation. A person who has undertaken such a course of study has a much richer and more sophisticated understanding of human beliefs and practices regarding the sacred, numinous, spiritual and divine.

In the field of comparative religion, the main world religions are generally classified as Abrahamic, Indian or Taoic. Areas of study also include creation myths and Humanism.

In the study of comparative religion, the category of Abrahamic religions consists of the three monotheistic religions, Christianity, Islam and Judaism, which claim Abraham (Hebrew Avraham אַבְרָהָם ; Arabic Ibrahim إبراهيم ) as a part of their sacred history. Other religions (such as the Bahá'í Faith) that fit this description are sometimes included but are often omitted.

Karen Armstrong FRSL (born 14 November 1944), is a British author and commentator who is the author of twelve books on comparative religion. A former Roman Catholic nun, she went from a conservative to a more liberal and mystical faith. Armstrong first rose to prominence in 1993 with her book, A History of God: The 4,000-Year Quest of Judaism, Christianity and Islam, an international best seller that is now required reading in many theology courses. Her work focuses on commonalities of the major religions, such as the importance, in many, of compassion or "The Golden Rule".

Armstrong received the $100,000 TED Prize in February 2008. She used that occasion to call for the creation of a Charter for Compassion, which was unveiled the following year.

Armstrong was born at Wildmoor, Worcestershire, into a family of Irish extraction who, after her birth, moved to Bromsgrove and later to Birmingham. In 1962, while still in her teens, she became a nun in the Society of the Holy Child Jesus, a teaching order, in which she remained for seven years. Once she had advanced from postulant and novice to professed nun, she enrolled in St Anne's College, Oxford, to study English. Armstrong left her order in 1969 while still a student at Oxford. After graduating with a Congratulatory First, she embarked on a DPhil on the poet Tennyson. According to Armstrong, she wrote her dissertation on a topic that had been approved by the university committee. Nevertheless it was failed by her external examiner on the grounds that the topic had been unsuitable. Armstrong did not formally protest this verdict, nor did she embark upon a new topic but instead abandoned hope of an academic career. She reports that this period in her life was marked by ill-health stemming from her life-long but, at that time, still undiagnosed temporal epilepsy.

Ahmed Hoosen Deedat (Arabic: احمد حسين ديدات; 1 July 1918 – 8 August 2005) was a South African writer and public speaker of Indian descent. He was best known as a Muslim missionary who held numerous inter-religious public debates with evangelical Christians, as well as video lectures, most of which centred around Islam, Christianity and the Bible. He also established the IPCI, an international Islamic missionary organisation, and wrote several booklets on Islam and Christianity which were widely distributed by the organisation. He was awarded the prestigious King Faisal International Prize in 1986 for his 50 years of missionary work. One focus of his work was providing Muslims with theological tools for defending themselves against active proselytising by Christian missionaries.^{[citation needed]} He used English to get his message across to Muslims and non-Muslims in the western world.

Ahmed Deedat was born in the town of Tadkeshwar, Surat, Bombay Presidency, British India in 1918. His father had emigrated to South Africa shortly after the birth of Ahmed Deedat. At the age of 9, Deedat left India to join his father in what is now known as Kwazulu-Natal. His mother died only a few months after his departure. Arriving in South Africa, Deedat applied himself with diligence to his studies, overcoming the language barrier and excelling in school, even getting promoted until he completed standard 6. However, due to financial circumstances, he had to quit school and start working by the time he was the age of 16.

Zakir Abdul Karim Naik (Urdu: ذاکر عبدالکریم نائیک; born 18 October 1965) is an Indian public speaker on the subject of Islam and comparative religion. He is the founder and president of the Islamic Research Foundation (IRF), a non-profit organisation that owns the Peace TV channel based in Dubai, UAE. He is sometimes referred to as a televangelist. Before becoming a public speaker, he trained as a doctor. He has written two booklets on Islam and comparative religion. He is regarded as an exponent of the Salafi ideology; he places a strong emphasis on individual scholarship and the rejection of "blind Taqlid", which has led him to repudiate the relevance of sectarian or Madh'hab designations, all the while reaffirming their importance.

Zakir Abdul Karim Naik was born on 18 October 1965 in Mumbai, India. He attended St. Peter's High School in Mumbai. Later he enrolled at Kishinchand Chellaram College, before studying medicine at Topiwala National Medical College and Nair Hospital and later the University of Mumbai, where he obtained a Bachelor of Medicine and Surgery (MBBS). His wife, Farhat Naik, works for the women's section of the IRF.

Brian Douglas Wilson (born June 20, 1942) is an American musician, best known as the leader and chief songwriter of the group The Beach Boys. On stage, Wilson provided many of the lead vocals, and often harmonized with the group in falsetto. Early during his on-stage career, Wilson primarily played bass on stage, but gradually transitioned to primarily playing piano/keyboards. Besides being the primary composer in The Beach Boys, he also functioned as the band's main producer and arranger. After signing with Capitol Records in mid-1962, Wilson wrote or co-wrote more than two dozen Top 40 hits including "Surfin' Safari", "Surfin' USA", "Shut Down", "Little Deuce Coupe", "Be True to Your School", "In My Room", "Fun, Fun, Fun", "I Get Around", "Dance Dance Dance", "Help Me Rhonda", "California Girls" and "Good Vibrations". These songs and their accompanying albums were internationally popular, making The Beach Boys one of the biggest acts of their time.

In the mid-60s Wilson used his increasingly creative ambitions to compose and produce Pet Sounds, considered one of the greatest albums of all time. At this point his music was considered to rival that of Lennon–McCartney. The intended follow up to Pet Sounds, Smile, was cancelled for various reasons, including Wilson's deteriorating mental health. Wilson's contributions to The Beach Boys diminished as the years went by, and his erratic behavior led to tensions with the band. After years of treatment and recuperation, he began a solo career in 1988 with Brian Wilson, the same year that he and The Beach Boys were inducted into the Rock and Roll Hall of Fame. Since then he has toured for the first time in decades with a new band and released acclaimed albums such as a reworked version of Smile in 2004, for which Wilson won a Grammy Award for "Mrs. O'Leary's Cow (Fire)" as Best Rock Instrumental, That Lucky Old Sun, and Brian Wilson Reimagines Gershwin.