Michael Bunker in Swarms of Locusts traced the path of the "free will" doctrine through history. He reveals the free will doctrine as a false gospel, which has been nurtured and promoted by the Roman Catholic Church. That false gospel rejects the sovereign grace of God in his election of those for salvation. It has found its way into modern Protestant theology. This injection of the Catholic theological poison into nominal "Christian" denominations is the result of a satanic conspiracy. This strategy will give rise to an ecumenical movement that will ultimately result in the nominal "Christian" denominations falling under the yoke of the Vatican.
Bunker explains that the false free will gospel doctrine was labeled Pelagianism after a fifth century A.D. theologian named Pelagius. Pelagius preached that man was completely free to do good or evil, and that God's grace only facilitated what man would choose in his own free will. Palagius further taught that man had a free will and could choose his own salvation. Pelagius, in order to remain consistent with his free will view, also taught that man could choose to fall away and lose his salvation by his own free choice. Pelagianism was seen by the Christian community as a false gospel and so it never really took hold.
Less than a century later, a form of Pelagianism rose from the ashes; it was known as Semi-Pelagianism. Under Semi-Pelagianism, man was fallen and his will was hindered by sin, but not totally so. According to Semi-Pelagians, man is not spiritually dead, but only spiritually sick. They taught that man could utilize his faith to cooperate with God in facilitating his own salvation. Semi-Pelagians accepted that God was sovereign but at the same time they promoted the inconsistent view that man had free will in order to choose whether to be saved. Semi-Pelagianism became the generally accepted doctrine of the Roman Catholic Church and was later codified as such at the Council of Trent (circa 1547). Semi-Pelagianism was promoted by a Jesuit priest named Luis de Molina. Molina taught the Semi-Pelagian view that God predestined believers to salvation but at the same time man had a free will to choose to be saved. This doctrine became popularly known as Molinism.
The Roman Catholic church knew that Protestant Christians would never adopt Molinism if it were known to have sprung from a Jesuit priest, so they decided to use a front man in order to introduce this false doctrine into the Protestant churches. They used a man named Jacobus Arminius (1560-1609), who was an admirer of Molina, to popularized the free will doctrine of Molina among Protestants. As a result of the successful efforts of Arminius and other Jesuit agents, Molinism has since become popularized not as Molinism but as Arminianism.
Many view Arminianism as an orthodox Christian view of Scripture, when in fact it is a corruption of the gospel that has been injected into the Protestant denominations by Jacobus Arminius. Arminianism is simply repackaged Roman Catholic doctrine. Arminiasm has been promoted by "Christian" luminaries all over the world including but not limited to John Wesley and Charles Finney of yesteryear to today's Billy Graham, Dave Hunt, Chuck Colson, Chuck Swindol, Chuck Smith, and Hank Hanegraff.
God, on the other hand, has made it clear in the Holy Scriptures that he is sovereign and salvation is by his grace through faith in Jesus Christ.