As I think I said somewhere else in this discussion, the way this issue arose wasn't by anyone actually claiming in so many words that "God 50% exists" is a sensible thing to say. Although I've kinda-sorta defended saying some things of that kind, I agree that it's not actually the best way to describe any state of affairs I can envisage. The actual question, IIRC, was whether it's reasonable to regard theistic evolution as intermediate between special creation and naturalistic evolution. Those are all positions that can be held by theists (though in practice not many theists embrace naturalistic evolution) and seeing them as points on a continuum really doesn't require one to endorse saying "God 50% exists" in any possible world.