As it says on the tin.
There are several old threads discussing the subject, but none of them seem to satisfactorily address the following two issues (particularly the second):
1) How well could it actually do? That is, how much of Iberia can it really gain control of and for how long?
2) To what extent will the Christian west attempt to destroy it? Including any surviving Christian states in Iberia.
Obviously there will be some hostility. Probably quite a bit. But France and England and other such states have other things that matter, and it may or may not be the most important issue at any given time.