The Quran has a challenge for all you nonbelievers out there. Compose a surah that is better than any of the Quran's surahs.
Here is the challenge from the Quran:
And if ye are in doubt concerning that which We reveal unto Our slave Muhammad), then produce a surah of the like thereof... Quran 2:23
Well that should be easy enough. Choose a surah from the Quran that you think is particularly awful (like Surah 111, for example) and write one of your own. If yours is better than the Quran's, then that will prove that the Quran is not the word of Allah (and that you are a better writer than Allah).
But be careful. This is what happens if you lose.
And if ye do it not - and ye can never do it - then guard yourselves against the Fire prepared for disbelievers, whose fuel is of men and stones. Quran 2:24
Sounds fair enough. Submit your surah and prove the Quran is not the word of Allah!