Please understand that the Protestant apologist wishes to “divide and conquer” by pitting one ECF against another or against the Church as a whole. Augustine is one of their favorite “spokesmen” - the “Proto-Protestant”, if you will.
Of course, they fail to recognize that Augustine would willingly submit to the Church’s declarations on any given subject because his spirit and theirs are vastly different. The Church has rejected Augustine’s harsher view.
From
newadvent.org/cathen/09256a.htm :
(The very last sentence is the most important of all)
2. Teaching of St. Augustine
In his earlier writings
St. Augustine himself agrees with the common
tradition. Thus in
De libero arbitrio III, written several years before the
Pelagian controversy, discussing the fate of unbaptized infants after death, he writes: “It is superfluous to inquire about the
merits of one who has not any
merits. For one need not hesitate to hold that
life may be neutral as between good conduct and
sin, and that as between
reward and
punishment there may be a neutral sentence of the
judge.” But even before the outbreak of the
Pelagian controversy
St. Augustine had already abandoned the lenient
traditional view, and in the course of the controversy he himself condemned, and persuaded the
Council of Carthage (418) to condemn, the substantially identical
Pelagian teaching affirming the existence of “an intermediate place, or of any place anywhere at all (
ullus alicubi locus), in which children who pass out of this life unbaptized live in
happiness” (
Denzinger 102). This means that
St. Augustine and the
African Fathers believed that unbaptized infants share in the
common positive misery of the damned, and the very most that
St. Augustine concedes is that their punishment is the mildest of all, so mild indeed that one may not say that for them non-existence would be preferable to
existence in such a state (
De peccat. meritis I, xxi;
Contra Jul. V, 44; etc.). But this
Augustinian teaching was an innovation in its day, and the history of subsequent
Catholic speculation on this subject is taken up chiefly with the reaction which has ended in a return to the pre-Augustinian
tradition.