Freedom of religion is one the fundamentals of international law, yet one of the major political ideologies of our time, Islamism, does not agree with this. Freedom of religion fundamentally clashes with the very concept of theocracy and hence there is very much need for an international convention that would ban theocracy as a crime against humanity. Freedom of religion is wholly incompatible with theocracy and theocracy must therefore be rejected as illegal under international law. However, this should be given further basis by means of an international convention specifically outlawing theocracy.