Science can determine some things. The notion of disorder is rooted in Greek natural philosophy=science, which means it may be open to observations of the natural "order" that differ from traditional notions. When science and religion disagree, there needs to be some adjustments so that religion reflects scientific truth.

If "science, medicine and psychology" determine that homosexuality is part of the natural order, theologians have to test that hypohesis against religious theory. This may be what Martin is doing, wihout knowing it. It may comeout that this new idea of order has nothing to do with natural order as currently posed. Or it may turn out that here are other principles of natural order that better explain the world. We don't know yet how this discussion will end.