It's a very extreme form of islam, which is popular in Saudi Arabia, and which the Saudis are promoting in the US.
Wahabism (various spellings) is a tool for terror.
It's got to be stopped in the US.
Its "true Islam" - Islam in itself is an extreme ideology. The wahabbis and the salafist movement in general want to return to Islam in its pure unadulterated form. They do not permit "bidah" (innovations) that came after the head pedophile and.