Did Surat Al-An'am descend all at once, or in stages? And is it obligatory to respond to those who deny the miraculousness of the Qur'an and prophethood?

Defending Islam and the Prophet is an obligation upon every Muslim, for the Prophet, peace be upon him, said: "Religion is naseeha (sincere advice)." We asked, "To whom?" He said, "To Allah, His Book, His Messenger, and to the leaders of the Muslims and their common folk." Naseeha to the Messenger includes believing him, obeying him, and supporting him, alive and dead, magnifying his right, reviving his Sunnah, spreading his call, and refuting accusations against it.

The length of books does not prevent one from responding to them to the best of their ability, for Allah Almighty says: "Allah does not burden a soul beyond its capacity" and "So fear Allah as much as you are able."

Responses can be disseminated by creating a special website, or via email, or by contacting websites concerned with refuting the misconceptions of Christians.