1) To speak of conversion, or the point at which the sinner is justified, in terms of either free or bound will is categorically incorrect. Humans are justified by faith. One essential element of faith is intellectual assent, or belief. We do not choose our beliefs. Belief is not, strictly speaking, any kind of an act of the will.
2) Nonetheless there are passages that speak of salvation in terms of choice, or at least in terms of acts of will. To reconcile some aspects of salvation being acts of will, and other aspects of salvation not being acts of will, requires some form of compatibilitic determinism. Libertarianism will not suffice to explain this apparent contradiction, because it allows the will to act autonomously. If the will should autonomously will for salvation, independently of the non-will aspects of justification, we would be required by scripture to view such a person as simultaneously saved due to the will-involved aspects justification, and damned due to the will-uninvolved aspects of salvation. Thus Libertarian Free Will fails.
2) Nonetheless there are passages that speak of salvation in terms of choice, or at least in terms of acts of will. To reconcile some aspects of salvation being acts of will, and other aspects of salvation not being acts of will, requires some form of compatibilitic determinism. Libertarianism will not suffice to explain this apparent contradiction, because it allows the will to act autonomously. If the will should autonomously will for salvation, independently of the non-will aspects of justification, we would be required by scripture to view such a person as simultaneously saved due to the will-involved aspects justification, and damned due to the will-uninvolved aspects of salvation. Thus Libertarian Free Will fails.