Religion (3) general stats

The current CIA world factbook tells us about the proportion of believers by religion.

In the World there are (as of 2010):

Christian 33.39% (of which Roman Catholic 16.85%, Protestant 6.15%, Orthodox 3.96%, Anglican 1.26%), Muslim 22.74%, Hindu 13.8%, Buddhist 6.77%, Sikh 0.35%, Jewish 0.22%, Baha'i 0.11%, other religions 10.95%, non-religious 9.66%, atheists 2.01% 

At adherents.com we find nice pie charts and other diagrams:
this below shows the number of 2005

For example in Hungary:
Roman Catholic 37.2%, Calvinist 11.6%, Lutheran 2.2%, Greek Catholic 1.8%, other 1.9%, none 18.2%, unspecified 27.2% (2011 est.)
In France:
Roman Catholic 83%-88%, Protestant 2%, Jewish 1%, Muslim 5%-10%, unaffiliated 4%
overseas departments: Roman Catholic, Protestant, Hindu, Muslim, Buddhist, pagan
In Germany:      
Protestant 34%, Roman Catholic 34%, Muslim 3.7%, unaffiliated or other 28.3%
In the United States:
Protestant 51.3%, Roman Catholic 23.9%, Mormon 1.7%, other Christian 1.6%, Jewish 1.7%, Buddhist 0.7%, Muslim 0.6%, other or unspecified 2.5%, unaffiliated 12.1%, none 4% (2007 est.)
In the UK:
Christian (includes Anglican, Roman Catholic, Presbyterian, Methodist) 59.5%, Muslim 4.4%, Hindu 1.3%, other 2%, none 25.7%, unspecified 7.2% (2011 est.)      

At adherents. com we also learn about the 

Top 10 Largest Highly International Religious Bodies

These are religious bodies in which at least 30% of their world membership live outside the "core country" (country with the largest number of members).

Religious Body	Number of Adherents
Catholic Church	1,100,000,000
Sunni Islam	875,000,000
Eastern Orthodox Church	225,000,000
Anglican Communion*	77,000,000
Assemblies of God	50,000,000
Seventh-day Adventists	16,811,519
Jehovah's Witnesses	16,500,000
Church of Jesus Christ of Latter-day Saints	12,275,822
New Apostolic Church	10,260,000
Ahmadiyya	10,000,000
Bahai World Faith	6,000,000