Human free will exists in sinners, but that it is compromised by sin.
Do Non-Christians Have Free Will?
This is exactly what has happened to humanity through sin. The human free will is biased toward evil. It really exists, and really can make decisions – just as the loaded scales still work. But instead of giving a balanced judgment, a serious bias exists toward evil. Therefore, human free will really exists in sinners, but that it is compromised by sin.