3. Rwanda
Increase: 347%
In the predominantly Catholic country Rwanda, Muslims represent the largest religious minority. In 2010 there were 190,000 of them, and by 2050 the group will have 850,000 members, which is a 347% increase. The group started to grow after the genocide in 1994, which was supported by some Church representatives and which made some people question their faith in Christianity and turn to Islam. Like in many other places in the world the number of people without religious affiliations will more than double.
