How rich.
I'm certain a man such as yourself is read up on a little history.
Pelagius is the root of Calvinism.
Augustine rightly claimed that salvation was by faith without works.
It was Pelagius, dear brother, who replied that 'faith is a work' arguing that Augustine thus contradicted himself.
Augustine, being of dim scriptural understanding of salvation (I've read hundreds of pages of his works) and falling for Pelagius' confounding of the works of the law with human volition (a confounding the Calvinist brethren have inherited from Pelagius) found himself bested by the argument (as many non-Calvinists still are when first faced with that sleight-of-hand confounding).
He was therefore forced to draw from the well of his former deterministic Manichaeism (all gnostic religions are deterministic, incidentally) and came up with the "actually it's God that makes us believe and so salvific faith is therefore not a work of man" counter-argument.
Then he mined the scriptures for proof-texts whose tenor resonated with his gnostic philosophy now fitted in Christian garb.
Calvinism therefore, you see, was unwittingly inseminated in Augustine by Pelagius and Manichaeism, and then unwittingly injected into Christian soteriology by Augustine.
That is why there are no Christian "Calvinist" authors before the 5th-century Augustine of Hippo.
No one else understood the "Calvinist" texts the way he did before him.
But who's listening...
The Foundation of Augustinian-Calvinism by Ken Wilson