The OP says 'cogent arguments to convince others'. That doesn't mean you need physical proof...unless your opponents won't be satisfied by anything less. Which is valid I guess, but I guess that people who need physical proof don't enjoy philosophy, psychology, sociology, economics...
Me personally, I can be swayed by philosophical arguments. So I don't mind making them. In philosophy, provability and unprovability doesn't change my ability to be convinced.
Still, I think that quantum mechanics over the next century or two will shed some very interesting light on deism.
Hmm?
Quantum mechanics (or other exotic physics) keeps telling us more and more about the nature of the universe, and about its origins. Scientists keep coming up with some VERY interesting theories about the start of the universe. If they nail them down securely enough, well, maybe it will let us explore the existence or nonexistence of stuff outside the universe. Is it possible for one universe to spawn other, entirely contained subuniverses? Maybe, and proving that it can or can't could conceivably tell us about what a creator could or must have done, or could tell us that a creator is strictly unnecessary. I can't predict what we'll find out or what it'll mean, only that I'm sure it will be very interesting. I mean...learning that the sun didn't revolve around the sun threw a wrench into religious cosmology, just think what the existence of other universes will do.
I'm still waiting for us to find something really weird in physical laws or in math, something that makes us go "Wait, how did THAT get there". Like, arranging the first 10^100 digits of pi in base 41 into a square matrix and seeing a perfect circle in zeroes. Or finding a physicalist explanation for consciousness.