Free will is a bit of an oxymoron, as will free of cause would be equally free of effect and the entire premise of will is to affect. We are part of nature’s process of selection.

It was proposed as a rebuttal to determinism, or pre-destination.

The premise of determinism is that reality is inherently inertial, with the future being determined by the past. Which is based on our narrative understanding of time. That the point of the present flows past to future.

The reality is that change turns future to past. Tomorrow becomes yesterday, because the earth turns. So the process of determination only occurs as the present, as all inputs are constantly re-arranging themselves into outputs.

The theological argument for pre-destination would be that a spiritual absolute would necessarily know our every move and its consequences.

Aside the problem of determinism, outlined above, the logical fallacy of the monotheistic presumption would that a spiritual absolute would be the essence of sentience, from which we rise, not an ideal of wisdom and judgement, from which we fell. Conflating the absolute with the ideal should have been a conceptual proposition dismissed centuries ago, but it still seems to bedevil our preference for reductionism over context.