Here is an honest Calvinist who recogniozes church history and the the Apostles and early church taught free will and synergism.
Here is the renown Calvinist Lorraine Boettner :
It may occasion some surprise to discover that the doctrine of Predestination was not made a matter of special study until near the end of the fourth century. The earlier church fathers placed chief emphasis on good works such as faith, repentance, almsgiving, prayers, submission to baptism, etc., as the basis of salvation. They of course taught that salvation was through Christ; yet they assumed that man had full power to accept or reject the gospel. Some of their writings contain passages in which the sovereignty of God is recognized; yet along side of those are others
which teach the absolute freedom of the human will. Since they could not reconcile the two they would have denied the doctrine of Predestination and perhaps also that of God's absolute Foreknowledge. They taught a kind of
synergism in which there was a co-operation between grace and free will. It was hard for man to give up the idea that he could work out his own salvation. But at last, as a result of a long, slow process, he came to the great truth that salvation is a sovereign gift which has been bestowed irrespective of merit; that it was fixed in eternity; and that God is the author in all of its stages. This cardinal truth of Christianity was first clearly seen by Augustine, the great Spirit-filled theologian of the West. In his doctrines of sin and grace, he went far beyond the earlier theologians, taught an unconditional election of grace, and restricted the purposes of redemption to the definite circle of the elect.
Even the late RC knows the origins of calvinistic doctrines
From R.C. Sproul:
“It has been said that all of Western theology is a footnote to the work of Augustine. This is because no other writer, with the exception of the biblical authors, has had more influence on Christendom. Thomas Aquinas quoted Augustine heavily when he composed his Summa Theologica. When Martin Luther and John Calvin were accused of teaching new doctrine, they pointed to Augustine as an example of one who had taught the things they were teaching… His Confessions is one of the most important autobiographies ever written.”
conclusion: It was the stoics, gnostic and manicheans who first taught unconditional election that augustine brought into the church and married it with christianity just like he did with total depravity which came from the same sources. Those who are familiar with church history know this to be true.

Calvin references augustine in his writings over 4,000 times.

That was his mentor, guide, leader, influencer whom he closely followed in his writings/teachings/doctrines. Calvin was a disciple of augustine. No ifs ands or buts about it those are the facts. As RC says augustine is the father of determinism. No augustine, no reformation.
I know my church history and do not turn a blind eye from the source of calvinism.
hope this helps !!!