Saudi Arabia - Conversion by a Muslim to another religion is punishable by death. Bibles are illegal. Churches are illegal.
Saudi Arabia pumps its petrodollar$ all around the world to foment Wahabbi Islam. They're largely responsible for the mess in Pakistan and Bangladesh. They'll gladly do it in America as well(if they haven't already, that is.), and have been greatly successful in Europe, especially in Britain and the Netherlands.