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Here is the break-away background and history of Christianity.

Moses around 1600 BC, received the Ten Commandments from God. This directly became the basis of Judaism and Jewish beliefs.

Judaism was the original one-God belief system (around 14 million)
Conservative Judaism
Orthodox Judaism (only officially recognized group)
Reconstructionist Judaism
Reform Judaism

Jesus (4 BC to about 30 AD), was crucified and became the basis of Christianity. (around 1869 million)
Roman Catholic Church (about 50 AD) begun by Saint Paul (around 1042 million)
Orthodox Church (around 900 AD) broke away from the Roman Catholic Church in the Great Schism (around 173 million)
Russian Orthodox Church (about 70 million)
Romanian Orthodox Church (about 21 million)
Greek Orthodox Church
Constantinople (a few thousand)

Protestant Church (1517 AD) broke away from the Roman Catholic Church in the Protestant Reformation (around 382 million)
Lutheran Church (1517 AD) begun by Martin Luther (around 70 million)
Moravian Church (1727) (about 360,000)
Brethren (1708) (about 170,000)
Amana Society (1842) (about 900)

Calvinism (1531)
Reformed Church (1537)
Reformed Church in America (RCA) (1748) (1867) (350 thousand)
Christian Reformed Church (CRC)
Presbyterian (1649) (about 50 million)
Disciples of Christ (1809) (1832) (about 1.1 million)
Christian Churches and Churches of Christ (1969)
Arminius (greatly influenced Wesley) (1610)

Zwingli Anabaptism (1523)
Free Church Tradition (1527)
Swiss Reformed Church (1523)
Congregational Christian Churches
Evangelical and Reformed Church
United Church of Christ (1957, combined CCC and ERC) (about 1.7 million)
Melchiorites (1533)
Mennonite Church (1536) (1591)
(Old) Mennonite Church (largest)
Amish (1693) (about 40,000)
Old Order Amish (majority)
Conservative Amish
Unitarian Church (1560) (1743) (about 173,000)
Hutterian Brethren (1533) (about 20,000)
Baptists (1611) (1639) (both Calvin and Zwingli) (about 35 million)
A multitude of relatively independent Churches
Landmark (1856)

Anglican (1647) (somewhat Calvinist) (about 75 million)
Episcopal (about 27 million)
Protestant Episcopal Church (1789) (about 2.5 million)
Methodist Church begun by John Wesley (1744) (about 38 million)
Holiness (1840s) (1880s)
Fire-Baptized Holiness Church (1895)
Church of the Nazarene (1908) (about 7000 congregs)
Salvation Army (1865) (about 2.5 million)
Pentecostal (1901) (about 51 million)
Assembly of God (1914) (about 2.1 million)
Church of God in Christ (1906)
Int'l Church of the Foursquare Gospel (1927)
Open Bible Standard Church
Pentecostal Church of God
United Pentecostal Church
Pentecostal Assemblies of the World
Church of God (Cleveland, Tennessee)
Pentecostal Holiness Church
African Methodist Episcopal Church (1816) (these three, about 2.5 million)
African Methodist Episcopal Zion Church (1820)
Christian Methodist Episcopal Church (1870)
Methodist Church (1939, combined MPC, MECS and MEC)
Evangelical United Brethren Church (EUB) (1946, combined 1807 Churches) (about 750,000)
United Methodist Church (1968, combined MC and EUBC)
Wesleyan Methodist Church (1840s)
Methodist Protestant Church (1828)
Free Methodist Church (1860)
Methodist Episcopal Church, South (1844)
Puritans (c. 1580)
Pilgrims (1620)

Eastern Rite Churches (about 11 million)
Alexandrian
Antiochene
Armenian
Chaldean
Byzantine
Ukranian Catholic Church (1596) (about 5 million)
Romanian Eastern Rite Church (1700)
Armenian Church (c.400 AD) (about 1.6 million)
Coptic Church (c. 400 AD) (about 7 million)

Mohammed (570 AD to 632 AD) initiated Islamic (Muslim or Moslem) belief.
Sunnites (656 AD) strict followers of the practices of the Prophet (the great majority of Muslims, around 950 million)
Shiites (656 AD) followers of Fatima/Ali (Prophet's son-in-law)
Twelvers (Ithna Ashariyya) (largest group)
Seveners (Ismailis)
Fivers (Zaydites)