I think that the "simpler philosophy" doesn't require an entity which is by definition supernatural
Gerry: I don't think the requirement that the Designer be supernatural is the complication you make it out to be; it's expected. For example, we all presume that the author of a book is "outside of" and "above" the book he writes; ditto for the programmer of virtual worlds, the architect of great (or not-so-great) buildings, etc.
...and thus for which no possible conclusive empirical evidence can be produced.
Which doesn't make the philosophy less simple; it simply places limits on the things that can be investigated in certain ways. Which limits are there, in any case. We can't for example, apply the usual scientific methods to things that are light-years away, since we don't even know if they still exist!
Surely you've heard of the story of Simon Laplace, and his reply to Napoleon: "Je n'avais pas besoin de cette hypothèse-là."--"I had no need of that hypothesis." The hypothesis being that the Christian god intervened in the mechanics of the universe.
Intervention is a later subject; creation is the first.
...the attempts of theists to add their favorite form of hypothetical Baggage to scientific investigations of the universe have continued to be marked by abject failure.
Here's how I see it. If there is no God, nothing matters and anything goes; eat, drink, and be merry, for tomorrow we die. But if there is a God, then all the "lesser" sciences (mathematics, physics, geology, biology, psyschology, sociology, etc) simply become contributing parts of Theology, the Study of God in and through His Works.