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The world's 5 inhabited continents contain almost 7 billion people. The population is increasing rapidly, and it doubled between 1960 and 2000. There are 237 independent states. 66 of these have significant restrictions on religious belief. About 30% of the world's population call themselves [[Christian]] (2 billion people), 20% call themselves [[Muslim]] (1.3 billion people), 15% are [[non-religious]] (1 billion) and 13% call themselves [[Hindu]]. Although [[Europe]] is rapidly becoming secular and non-religious, the majority of Christians live in areas where European settlement or missionary work has been significant. [[Asia]] is the least evangelised evangelized continent. Of Christians, there are about 1 billion [[Roman Catholic]], 700 million [[Protestant]] and 550 million [[Eastern Orthodox]] Christians.Also see [[Christianity by country]]