World Religions: estimated adherents

Chart from
http://www.adherents.com/adh_branches.html

Branch	Religion	Number of Adherents
Catholic	Christianity	1,050,000,000
Sunni	Islam	940,000,000
Vaishnavites	Hinduism	580,000,000
Orthodox/Eastern Christian	Christianity	240,000,000
Shaivites	Hinduism	220,000,000
Conservative Protestant	Christianity	200,000,000
Mahayana	Buddhism	185,000,000
Liberal Protestant	Christianity	150,000,000
Theravada	Buddhism	124,000,000
Shiite	Islam	120,000,000
African indigenous sects (AICs)	Christianity	110,000,000
Pentecostal	Christianity	105,000,000
Anglican	Christianity	73,000,000
Sikhism	Sikhism	23,000,000
neo-Hindus and reform Hindus	Hinduism	22,000,000
Lamaism (Vajrayana/Tibetan, etc.)	Buddhism	20,000,000
Jehovah's Witnesses	Christianity	14,800,000
Latter Day Saints	Christianity	12,500,000
Ahmadiyya	Islam	10,000,000
Veerashaivas (Lingayats)	Hinduism	10,000,000
Baha'i World Faith	Baha'i Faiths	6,000,000
Conservative	Judaism	4,500,000
Unaffiliated and Secular	Judaism	4,500,000
Svetambara	Jainism	4,000,000
Reform	Judaism	3,750,000
Seicho-No-Ie	New Japanese	3,200,000
Shinto all branches	Shinto	3,000,000
Tenrikyo	New Japanese	2,800,000
PL Kyodan	New Japanese	2,600,000
Orthodox	Judaism	2,000,000
New Thought (Unity, Christian Science, etc.)	Christianity	1,500,000
Sekai Kyuseikyo	New Japanese	800,000
Sthanakavasis	Jainism	750,000
Zenrinkai	New Japanese	600,000
Druze	Islam	450,000
Tensho Kotai Jingukyo	New Japanese	400,000
Friends (Quakers)	Christianity	300,000
Ennokyo	New Japanese	300,000
Digambaras	Jainism	155,000
Reconstructionist	Judaism	150,000
Parsis	Zoroastrianism	110,000
Gabars	Zoroastrianism	20,000

The source site list the last update as of 28 October 2005, and so these are 2005 statistics. Please see my notes in comments.

Bonus


Celtic vs. AC Milan, October 3, 2007
A fan runs on the field, and the goalkeeper dives. One wrong warrants another?