:^)
Life, even its most simple form, hands off life to non-living matter. I find that to be evidence of something unseen. It, whatever it is could dwell beyond the universe that we can detect. Therefore, belief that there's more to this existence than that which can be quantified is a rational belief. For me, *it* is of God. For an agnostic, it could be something extra-natural. My way or the agnostics way would leave inquiry open to possibilities, making way for each thinking of ways to detect it.