I guess we will have to stay on opposite sides of the aisle on the whole natural versus spiritual thing.
Remember though that just because that is the way you see it does not necessarily make it to be true. Only when we do not discard opposite opinions before we even consider them are we able to improve on our knowledge of truth or reality.
With respect to carbon monoxide, it can be perceived by the senses. The danger though is that because it is dangerous in small doses, damage may have been done before it is perceived, hence the sensors.
Personally, I believe in the spiritual, have experienced the spiritual, know from personal experience the realm of the spiritual exists.
It is only because some people react to the term ‘spiritual’ that I consider alternatives. In the attempt to substitute alternatives, however, there can be some loss of precision of meaning.
In the Bible the Apostle Paul declares (I paraphrase and amplify):
If your knowledge of God is working for you, giving you peace and joy — the everyday practical reality of true spirituality — hold on to it (Philippians 3:16).
I guess we both best hold on to that wise thought.