Cool quiz! Will you maybe add more religions to make it more tricky? Maybe Zoroastrianism, Jainism, Taoism, Judaism, Shinto, Sikhism, Taoism, etc? Make it the top 12 biggest Religons in the World quiz :)
Could you accept "Christian"? I just found out "christianism" to have a different meaning because of some crazy right wingers in the US, but all religions finish in "-ism", not only in English but other languages too (in Spanish "-ismo", in German "-heit").