There was no making someone reject God. The curse of sin means we are all born in sin and naturally are in rebellion against God by virtue of Adam.so, for these to be "able" to reject the Gospel, must mean that they have a "free will" to do so? Or do you suppose God "made" them reject the Gospel? You can see the folly of Calvinism!
Free will means we can override God's will and choose independently over the ordination of God. Free will makes man co-rulers with God and the final decision maker over God's will.
In that light, human will is never free. We are slaves to sin and, if God chooses to redeem us, we are then bond servants to the King.