I think that would be too simplistic. Certainly there's money coming from groups in Saudi Arabia that are more conservative. But the fact is, a lot of the groups are well funded to begin with.
Religious extremism has been bubbling up in Indonesia since 1945, well before Saudi funding sources were on the scene. But it is something to worry about, especially when groups become so well funded that they can buy elections at the local level, and things like that. You start to wonder, there's a lot of money here; what's going on?