I don't really think that the case can be argued either way. If John the Baptist was "filled with the Holy Spirit" and yet UnRegenerate, he's about the only one in the whole of Scripture of which I am aware. And there's no intrinsic reason within the Text to regard the baby John as being UnRegenerate; the usual reason why an Arminian would do so is purely extrinsic -- the desire to "keep safe" one's Arminian Theology, from what the Bible is actually saying.