And if they remonstrate with you, tell them: 'I have submitted my whole being to Allah, and so have those who follow me.' And ask the People of the Book as well as those who follow no heavenly Scripture: 'Have you also submitted (to Allah)?' If they have submitted to Him, they are indeed on the right way but if they deviate from submitting to Allah, then your duty is merely to deliver the message. Allah observes the affairs of His servants.