Free will and determinism seem increasingly like the same thing. You choose based on your preference. Determinism is using extrapolation to fruitlessly maintain that this makes us inherently predictable with more knowledge, which is obviously true to anyone who is familiar with the concept of being acquainted with someone. Freewillyism meanwhile stresses that it's impossible for anyone to have that much knowledge (or extract it consistently enough to be properly useful) - including the gods themselves. This is also completely and obviously true to anyone who is familiar with the experimental methods of psychology or really anything which tries to measure something that hasn't been made specifically to be measured. There's a reason a dice roll is said to be random, after all. Nobody's going to actually calculate that shit with relativistic mechanics, aerodynamic calculations and material science insights or obtain the necessary precision with any of the previous to say with reasonable certainty what side a die will land on in any given moment. Or discovering where an electron is inside an atomic orbital as well as ascertaining its momentum, which has the additional difficulty of being physically impossible if I understand correctly.
So from my point of view, determinism is correct. But it doesn't actually matter, since determinism posits a theoretical, impossible state of absolute knowledge (which if, say, the LORD were to actually possess, would also render any action of His entirely pointless). So free will exists by default. I guess the problem begins when somebody notices that an essentially unfillable gap (aside from this bit, greatest hits include things outside the universe and times which actual history has not properly documented) is quite possibly the very best place to inject some God into. Infuriating, I suppose, but still irrelevant, no?