What is the connection between Methodological Naturalism and Philosophical Naturalism? Several years ago, Barbara Forrest attempted to clarify this relationship. Her essay is still pertinent today. Below is the abstract of the article:
In response to the charge that methodological naturalism in science logically requires the a priori adoption of a naturalistic metaphysics, I examine the question whether methodological naturalism entails philosophical (ontological or metaphysical) naturalism. I conclude that the relationship between methodological and philosophical naturalism, while not one of logical entailment, is the only reasonable metaphysical conclusion given (1) the demonstrated success of methodological naturalism, combined with (2) the massive amount of knowledge gained by it, (3) the lack of a method or epistemology for knowing the supernatural, and (4) the subsequent lack of evidence for the supernatural. The above factors together provide solid grounding for philosophical naturalism, while supernaturalism remains little more than a logical possibility.