I’m just now realizing that your knowledge of history is literally non-existent. The correct answer to your question is that nothing happened to the people who did not accept Islam, except that they were subject to a special poll tax called the jizya and that was it. For example, a large Jewish community lived in Jerusalem without problems until the moment when the Crusaders, at the very end of the 11th century, conquered the city and killed practically all the Jews in it. By the way, Jews fought side by side with Muslim soldiers during the siege of Jerusalem…