1.  Burkina Faso CIA Factbook
[By CIA THE WORLD FACTBOOK]
Religions:
Muslim 60.5%, Catholic 19%, animist 15.3%, Protestant 4.2%, other 0.6%, none 0.4%

Population:
17,275,115 (July 2012 est.)
country comparison to the world: 61
note:estimates for this country explicitly take into account the effects of excess mortality due to AIDS; this can result in lower life expectancy, higher infant mortality, higher death rates, lower population growth rates, and changes in the distribution of population by age and sex than would otherwise be expected

2. Burkina Faso Info
[Published by the U.S. Department of State Website]

People
Nationality: Noun and adjective--Burkinabe (accent on last e).
Population (2006): 14.4 million.
Annual growth rate (2005): 2.53%.
Ethnic groups: 63 ethnic groups among which are Mossi (almost half of the total population), Bobo, Mande, Lobi, Fulani, Gourounsi, and Senufo.


Religions: Traditional beliefs 20%, Muslim 55%, Christian 25%.
Languages: French (official), Moore, Dioula, others

3.  Islam in Burkina Faso
[By WIKIPEDIA]
Islam in Burkina Faso (Upper Volta) has a long and varied history. As of today, the population of the country is 50 percent Muslim.

Until the end of the 19th century, the Upper Volta was dominated by the Mossi kingdom, who are believed to have come from central or eastern Africa sometime in the 11th century. The Mossi initially defended their religious beliefs and social structure against Islamic influencs from Muslims from the northwest.