Presupposing freewill theism is the opposite of the Naked Bible method
Modern ideas about libertarian free will, conditioned by our culture and theological history, are completely foreign to the assumptions that ancient readers would have brought to the Bible.
Why do some people exercise faith and others not?
In a synergistic framework, what is the explanation for some people responding affirmatively to prevenient grace, while others do not? If it is because of the grace they receive, then God shows partiality; if it is because of their character, then they have reason to boast; if it is neither, then salvation is down to luck.