(Reuters) - Atheists and other religious skeptics suffer persecution or discrimination in many parts of the world and in at least seven nations can be executed if their beliefs become known, according to a report issued on Monday.

The study, from the International Humanist and Ethical Union (IHEU), showed that "unbelievers" in Islamic countries face the most severe - sometimes brutal - treatment at the hands of the state and adherents of the official religion.

But it also points to policies in some European countries and the United States which favor the religious and their organizations and treat atheists and humanists as outsiders.

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