Theological noncognitivist / igtheist - which from my POV is a stronger position than atheism. Theist, agnostic, and atheist positions all imply there's a concept, "God", which is clear enough to refer to a potential something "out there", whose existence a person can accept, reject, or be unsure about. Meanwhile igtheism holds that the concept is so unintelligible that any statements about it are nonsense.