The Qur'an is not the word of God but on the contrary the handiwork of the satan ?
In reply to a similar allegation put forward by the pagans of makkah, that the Prophet (pbuh) received the revelations from the devils , the following verses were revealed:
Surah waqiah, chapter 56 verses 77-80
"that this is indeed a qur'an most honourable, In a book well-guarded, Which none shall touch but those who are clean, a revelation from the lord of the worlds."
Kitabim maknoon means a book well guarded or a protected book, referring to lauh-e-mahfooz in the heaven, which none shall touch except the mutahhareen. ie Those who do not have any uncleanliness or impurity or evil like sin. This refers to the angels. The satan and devils are absolutely prohobited.
Thus since it is impossible for satan to come anywhere close to it or touch it, the question of him writing the verses of the glorious qur'an does not arise.
It is further mentioned in surah shura, chapter 26 verse 210-212
"no evil ones have brought down this (revelation): It would neither suit them nor would they be able (to produce it). Indeed they have been removed far from even (a chance of)hearing it."
Many people have a wrong concept of satan. They think that satan can probably do everything, except a couple of things that god can do. According to them, satan is slightly below god in power. Since the people do not want to accept that the qur'an is a miraculous revelation, they say that it is satan's handiwork.
If satan would have written the qur'an, he would not have mentioned in the same qur'an in surah nahl, chapter 16 verse no. 98
"when thou does read the qur'an, seek Allah's protection from satan the rejected one."
Is this how you feel satan would write a book? Does he tell you; "before you read my book ask god to save you from me?"
There are several verses in the qur'an which will give enough evidence that satan is not the author of the qur'an.
In surah al aaraf chapter 7 verse 200
"if a suggestion from satan assail your (mind), seek refuge with Allah; for he hears and knows (all things)."
Why would satan tell his followers, that whenever he gives any suggestions to them, they should seek refuge in Allah (swt) to whom he is an avowed enemy.
In surah baqarah, chapter 2 verse 168
"o ye people! Eat of what is on earth, lawful and good; and do not follow the footsteps of the evil one, for he is to you an avowed enemy."
In surah yasin, chapter 36 verse 60
"did i not enjoin on you, o ye children of adam, that ye should not worship satan; For that he was to you an enemy avowed?"
Satan is intelligent, no wonder that he can put this idea into the minds of people that he himself wrote the qur'an. Compared to almighty god, satan is insignificant, and Allah (swt) is far more intelligent. He knows satan's evil intentions and hence no wonder that he has given the reader of the qur'an several proofs to show that qur'an is god's word, and not satan's word.
The bible mentions in the gospel of mark, chapter 3, verses 24-26
"and if a kingdom be divided against itself, that kingdom cannot stand." "and if a house be divided against itself, that house cannot stand." "and if satan rise up against himself, and be divided, he cannot stand, but hath an end."(Source IRF)