I would say that the koran being created by god or not is still debated, and there were movements like 1000 years ago arguing that the koran is a product of it's time and can be changed. Ibn Taymia (fuck him) was killed by the kalif for claiming the koran was perfect and couldn't be reinterpreted.

I am not sure about the other modern schools but Ibn Taymia became the thought-father of hanbalism of which salafism and wahabism are branches, the most reactionairy form of islam and also one of the less popular by population. The wahabites are also the ones always crying about Shirk, the rest don't consider, for examble, historical buildings, Shirk, or care as much about the concept in the first place.

The others as far as i know don't belive the koran is crated by god.

I hope i translated the terminology right.