The Ahmadiyyas are regarded as heretics by the orthodox Muslims because Mirza Ghulam Ahmad proclaimed himself the Mahdi of Islam, the Christian Messiah, and the final avatar or incarnation of Vishnu and also because they do not believe that Muhammad is the last prophet. Based on divine revelations, he declared that he resembled Jesus in face and stature, and had been sent to 'break the cross', and show crucifixion to have been a fable. Thus, the majority of Muslims do not refer to the Ahmadis by this name, but use the derogative Qadianis (Qadian, in northwest India, is the birthplace of Ahmad) and Mirzai (referring to Mirza Ahmad). By using these terms, the point is being made that Ahmadiyya is a new religion founded by a particular person at a particular time, unlike Islam which is universal: Muhammad is a Prophet, not a founder, and therefore it is considered derogative to refer to Islam as 'Muhammadism'.