His problem is that a demonstration is not convincing, since to be convinced requires assent by the “convincee”.
If the “convincee” thinks the price of changing gods is too high (it might include admitting that he was wrong!), or the risk too great, his “most important”/”greatest thing in the universe” won’t change.
What does it mean to me if I believe that something is the most important thing in the universe? On reflection, it needn’t mean anything unless it is also the most important thing in “my universe.”
I could claim, for instance, that the most important/greatest thing in the universe is Cygnus X-3. It’s the center of the universe (so is anywhere else, of course) and a thing of immense power–nothing in our galaxy comes close. Yet I cannot even see it; nothing it is doing has any bearing on me (yet!), nor does anything I do have any bearing on it. It makes no demands of me, offers no benefits. It is King Log–or perhaps I should say “God Log.” In “my universe” the Earth and Sun are more important–I rely on them every day–as are other things like my wife and home and even my library.
I could claim that the deist god is the ultimate. The Watchmaker non-interventionist god makes no more demands on my life than does Cygnus X-3, though it does help my mind understand the world better, and begin to understand understanding.
In a purely materialist universe I have no reason to claim I truly know anything–I react in certain ways, and that’s all one can say. A deist can point to an origin in order and reason, and to some degree share in that. A deist has a different (I would say higher) conception of himself because he has a different (higher) conception of his god.
Unfortunately the term “Greatest” or “Most important” is a bit ambiguous in “my universe.” Theory and practice diverge. I may say that (e.g.) my wife is the most important thing in “my universe”, and even be willing in a pinch to give up my life for her (giving up everything else in the process), but have little reflection of this value in day to day decisions or attitudes.
Alternatively, I might say that I valued God more than anything, and am committed to my religious duties–unless there’s a game on. Or that all fellow believers/worshippers are my brothers and sisters unless one expresses a political view I don’t like.
In both sets of examples my nominal values conflict with my values as expressed in action. The inconsistency might be due to indiscipline, or there might be an unacknowledged greater value. One, or perhaps both, of those values is an idol for me. (You can easily devise other examples–a good Volk-worshiper who believed the Nazi party was its prophet who nevertheless out of compassion fed strangers without asking if the fugitive was Jewish.)
One can make a test out of this: “By their fruits you will know them.” Do I get more riled when somebody insults my favorite candidate or when someone insults my God? (I can make the excuse that God can take care of Himself but I have to look out for the reputation of my fellow-human. It would even likely be true for insults to family.) Does that tell something about what the real god of “my universe” is?
It might. We have it on good authority that it can be a useful way to find out what somebody else’s real god is too. But it might be merely the result of a sloppy life, or not having worked through the details yet. We’re good at giving ourselves the benefit of the doubt–except for those of us who are skilled at looking for worst cases in ourselves.
Take it a bit further. The work I do demands concentration on the thing more often than the purpose. That doesn’t necessarily mean I value the thing more than the purpose–though that is a risk–but how much should the purpose be part of my mind as I work? Am I working as if for the Lord if I’m thinking entirely about how to get this next leg attached to the chair?
I think the answer might be yes. Obviously that would make the test even less clear-cut that it already is. I suspect we need to be careful judging others, and also be careful judging ourselves. But not complacent. There are plenty of idols around, and plenty of people who are unquestionably idolaters. Greed amounts to idolatry, and we’re a-swamp in that–as usual. I could go on listing other idolatries to which I am not greatly tempted, but I think I’ll stop here.
But what my god is shapes what I choose, and shapes me.