Have seen it. Am not impressed. To me, it's a piece of racist propaganda. The film opens with a quote from the Koran. This quote pupports to suggest that Muslims must arm themselves and butcher their enemies. In reality however, this quote is truncated. The real quote suggests that Muslims should amass as much force as possible to facilitate getting the best possible deal when suing for peace (a show of arms to show the alternative to peace). After that it's all mush that attempts to bypass the intellect and set aflame the passions. I'd say this piece of tripe has more in common with the bowel than the heart.
I'm neither a Muslim nor a Christian. And I'd not have a lot of good to say about either religion. What I'd have to say on either religion would not be said to demean or to promote hatred. That cannot be said of Fitna, in my opinion.