What a good question!
Well, free will is something that can only exist if God exists. Why? Because if we're all just highly evolved deterministic animals, like Evolutionists falsely spout, then free will would not be a reality as animals, no matter how "evolved" they're, do not possess a will like human beings do.
Free will doesn't just exist, it must exist. Why must it exist? Because without free will moral accountability would be redundant as nobody would be in control of their urges, thoughts, actions, etc. So, ultimately, if there were no free will, there would be no point in isolation as one would not be able to repent, reflect upon or even change their nature as it'd be innate, it'd ultimately just be luck of the draw, so to speak.
So, yes, free will does exist, because it has to exist, because the One True God of the Holy Bible exists as He wills free will to exist!
I'm a proud and devout Christian