The point of saying that everyone is religious is simply that there is a significant analogy between religion and, say, atheism. The analogy is that both begin with presuppositions that serve as standards of truth and cannot be proved without those presuppositions. I think that’s very much analogous to religious faith. But if your friend objects strenuously to this, then you can just drop talk of religion and faith and instead talk about presuppositions or paradigms (Thomas Kuhn). I develop this