Some Distinctions Concerning Methodological Naturalism

I think we need to distinguish between someone who says "We will be methodological naturalists in the way in which we do science," and someone who says "No one is doing science who does not observe MN." Also there is a difference between MN as a defeasible heuristic and MN as an absolute. when Lewontin says "Our commitment to materialism is absolute, for we cannot allow a Divine Foot in the door," I think we have the kind of dogmatic naturalism that concerns me. But not every version of MN is similarly open to objection.