Chinese is an ethnic group, Indonesia is another. But Muslin is a religion. People can always change their religion anytime with or without reasons. While people cannot chance their ethnic group, cannot change their race. There are lots of Muslim in China itself. So there must more Chinese Muslim in Indonesia, because Indo is a Muslim country. And also most people may deny they are Chinese even though they are ethnic Chinese. So, Firda could be a Chinese-Indonesian, and Muslim as well.