Calvinism: God is the author of both good and evil. He foreordains men’s choices and then holds them fully accountable for those choices which were forced on them. He forces some to love him and then seems pleased that they do and rewards them. He forces others to sin and then is angered that they do and punishes them.
Arminianism: God is the author of good and it is against his nature to do evil. The potential for evil is one of the trade-offs which exists by virtue of the fact that we have been given free will. God created a world that includes freedom and contingency and in his love, he operates providentially and redemptively within the world. Empowered by God’s prevenient grace, men either choose to serve God or to reject him. As such God justly holds them fully accountable for their choices.