To put it another way, Chinese folk religion is about "orthopractice": as long as the methods and rituals are correct, they'll work. It doesn't care too much about what you believe--unlike Christianity, which is about "orthodoxy" and demands firm belief.
話說回來，中國的民俗宗教是 orthopractice ﹘﹘只要方法儀式對就會靈，不太管你心裡想什麼；不像基督教講「正信」﹘ orthodoxy，要求信仰堅定。