Why Is the Religion of Islam Not Spread by Means of Angels

Question

In the world there are followers of various religions, and each holds his own religion to be correct and lives by the principles laid down by that religion. About eighty per cent of people do not accept Islam as the true religion. Why then, in such a state, does Allah the Exalted not spread the religion of Islam by means of some angel or some friend of Allah, and not save innocent people from the deception of Satan?

Answer

The conveying of the religion of Islam rests upon the Muslims, not upon the angels. The friends of Allah have always spread the religion of Islam, and at the hand of a single friend of Allah thousands of people accepted Islam; and even now the friends of Allah are constantly engaged in this effort.

Source: Fatawa Mahmudiyya

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