I want to know the answer to the following question:
Along with Christians and Jews, what was a major non-Muslim religious group under the Umayyads?
All the background I'm provided with is that "It is not clear how Umar attempted to resolve this situation, but the sources portray him as having insisted on like treatment of Arab and non-Arab (mawali) Muslims, and on the removal of obstacles to the conversion of non-Arabs to Islam.". Is that enough to answer the question?
Answer: no