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Point one: The immaculate conception is the belief that Mary was born without sin, not the virgin birth, as you seem to think. (I thought they were the same for many years too).
Point two: I'd call that belief extra-scientific rather than anti-scientific:. A one off event attributed to a miracle that can in no way be proved or disproved by science. "Intelligent design" is, in some sense, the same, but since the proponents are clearly "anti-science" I'd say ID itself is anti-science.