In Islamic theology, God (Arabic: Allāh) is the all-powerful and all-knowing creator, sustainer, ordainer, and judge of the universe. Islam emphasizes that God is strictly singular (tawhid) unique (wahid) and inherently One (ahad), all-merciful and omnipotent. According to Islamic teachings, God exists without place and according to the Qur'an, "No vision can grasp Him, but His grasp is over all vision. God is above all comprehension, yet is acquainted with all things" (Qur'an 6:103) God, as referenced in the Qur'an, is the only God and the same God worshiped by members of other Abrahamic religions such as Christianity and Judaism. (29:46).

In Islam, there are 99 Names of God (al-asma al-husna lit. meaning: "The best names") each of which evoke a distinct attribute of God. All these names refer to Allah, the supreme and all-comprehensive divine name. Among the 99 names of God, the most famous and most frequent of these names are "the Compassionate" (al-rahman) and "the Merciful" (al-rahim). Creation and ordering of the universe is seen as an act of prime mercy for which all creatures sing God's glories and bear witness to God's unity and lordship. God responds to those in need or distress whenever they call. Above all, God guides humanity to the right way, “the holy ways.”

Abadin Tadia Tjoessoep (1626–1699), more commonly known as Sheikh Yusuf, was an Indonesian muslim of noble descent. In 1693 he was exiled to the Cape of Good Hope which resulted in his establishing Islam in the Cape.

Yusuf was born in Makassar, Indonesia, the nephew of King Biset of Gowa. In 1644 he embarked on the Hajj to Mecca and spent several years in Arabia learning under various pious scholars. During this period the Dutch and British East India Companies were fighting for control of the region due to its lucrative trade in spices and gold. When Yusuf left Arabia in 1664, Makassar had been captured by the Dutch, and he was unable to return home. Instead, he headed for Bantam on the island of Java, where he was welcomed by Sultan Ageng Tirtayasa. Ageng gave Yusuf the hand of one of his daughters in marriage, and made him his chief religious judge and personal advisor. Yusuf stayed in Bantam for 16 years until 1680, when Ageng's son, Pangeran Hajji, rose against his father, possibly at the urgings of the Dutch East India Company. Ageng rallied his forces, including Yusuf, and in 1683 besieged Hajji in his fortress at Soerdesoeang. Ageng was defeated but managed to escape capture, along with an entourage of about 5,000, among them the 57-year-old Yusuf. Ageng was captured later that year but Yusuf managed to escape a second time and continued the resistance.

Yusuf Estes (born in 1944) is an American Muslim preacher and teacher who converted from Christianity to Islam in 1991. He was a Muslim Chaplain for the United States Bureau of Prisons through the 1990s. He was a Muslim Delegate to the United Nations World Peace Conference for Religious Leaders held at the U.N. in September 2000.

Active in Islamic missionary work in the United States, Estes is often featured as guest presenter and keynote speaker at various Islamic events as well as frequently appearing on various Islamic satellite TV channels. Estes takes a dim view of today's public school system in the United States for any children, and highly recommends schools where they might receive a religious education combined with more advanced scholastic education.

Yusuf Estes was born in Ohio, and was raised in Houston, Texas in a Anglo-Saxon Protestant family. From 1962 to 1990, his career was in the music, entertainment and marketing fields. He also taught music and served as a music minister. He owned several musical instrument companies including the Estes Piano and Organ Company. He produced and directed live entertainment programs in the United States from the mid 1960s until his last endeavor for cable TV in Florida, entitled 'Estes Music Jamboree'.

Hamza Yusuf Hanson is an American Islamic scholar, and (with Zaid Shakir and Hatem Bazian) is co-founder of Zaytuna College in Berkeley, California, United States. He is a convert to Islam, and is one of the signatories of A Common Word Between Us and You, an open letter by Islamic scholars to Christian leaders, calling for peace and understanding. He has described the 9/11 attacks as "an act of 'mass murder, pure and simple'". Condemning the attacks, he has also stated "Islam was hijacked ... on that plane as an innocent victim".The Guardian newspaper in the United Kingdom reported that he "is arguably the west's most influential Islamic scholar" and added that "many Muslims find his views hard to stomach."

Hamza Yusuf was born to two academics in Washington State and raised in Northern California. In 1977, he became Muslim and subsequently traveled to the Muslim world and studied for ten years in the United Arab Emirates, Saudi Arabia, as well as North and West Africa. Hamza Yusuf spent four years studying in the United Arab Emirates and elsewhere in the Middle East. Later he traveled to West Africa and studied in Mauritania, Medina, Algeria, and Morocco under such scholars as Murabit al Haaj; Baya bin Salik, head of the Islamic court in Al-'Ain, United Arab Emirates; Muhammad Shaybani, Mufti of Abu Dhabi; Hamad al-Wali; and Muhammad al-Fatrati of Al Azhar University in Cairo, Egypt.^{[citation needed]} After more than a decade abroad, he returned to the United States and earned degrees in nursing from Imperial Valley College and religious studies at San José State University.^{[citation needed]}

Jamal A. Badawi (Arabic: جمال بدوي‎) is an Egyptian born Muslim Canadian former professor in the Sobey School of Business, Saint Mary's University in Halifax, Nova Scotia. He is an author, preacher and speaker on Islam.

He completed his undergraduate studies at Ain Shams University in Cairo, Egypt. He left for the U.S. in the 1960s and completed his Masters and doctorate, both in the department of Business Administration, at Indiana University in Bloomington, Indiana. He has been serving as a volunteer imam of the local Muslim community in the Halifax Regional Municipality since 1970. He cites Hassan al-Banna and Muslim Brotherhood as his source for inspiration.

In addition to his participation in lectures, seminars and interfaith dialogues in North America, Badawi was invited as a guest speaker in various functions throughout the world. He is also active in several Islamic organizations, including the Canadian Council on American-Islamic Relations, the Fiqh Council of North America (FCNA), the Muslim American Society (MAS), and the European Council for Fatwa and Research (ECFR). He is also a member of the Islamic Society of North America (ISNA) and the founder and chairman of the Islamic Information Foundation, a non-profit foundation seeking to promote a better understanding of Islam and Muslims towards non-Muslims. He has lectured extensively in North America and abroad, and speaks on a variety of topics including Islam and Christianity and is a guest scholar at The American Learning Institute for Muslims.