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Religious freedom is the right of a person to possess the faith you want, or be an atheist or agnostic, and inner belief, and therefore could not be restricted, but it is also the power to externalize those religious sentiments, when the has, through worship, every religion has provided, and these acts of worship are what allow the interference of the state to regulate. In some cases, these limits are imposed for serious reasons, for example if they affect public order, morality, security or the rights of others, but in other cases, the prohibition of certain cults, due to discriminatory reasons.
Religious freedom was one of the main concerns of the liberal state that emerged after the French Revolution of 1789, to wean the temporal power of the spiritual over the traditional position of the church related to power, and religious instruction in public schools . The latter was a long struggle, which still exists in many cases.
Religious intolerance led to bloody battles between Moors and Christians, Catholics and Protestants, persecutions of Jews who extremaron during Nazism, which also included Jehovah's Witnesses, etc., which is why the desire for religious freedom, although has resulted in most western constitutions and in international law, is often limited in practice discriminatory acts and even being attacked.
Religion is generally imposed on the individual by family mandate, but the freedom that has as a person, you can change or can not take any when I grow up.