The Sword of Truth series by Terry Goodkind has a lot of atheist philosophy throughout. The author uses his characters (especially the main character) to rail against religion and theocracy, but it is a fantasy series and set in a fictional world (complete with magic). The 'evil empire' in the series is representative of Christianity and Islam and Mr. Goodkind does an amazing job of tearing it down. The problem is that the series encompasses 11 books averaging around 800 pages per entry.
It is one of the best fantasy series ever written, though. It was worth reading for the enjoyment alone. The anti-religious message was a pleasant surprise.
It is one of the best fantasy series ever written, though. It was worth reading for the enjoyment alone. The anti-religious message was a pleasant surprise.