With most of the Roman School, Vázquez holds such grace can be given to those without faith
So although that doctor thinks some help of the grace of Christ is needed for anyone to act morally well, he holds with by far the largest part of the Roman School that this grace can be given to someone who has no faith. By 'faith' he means not only true faith in Christ but any knowledge at all of the one true God, which can be found not only in heretics but also in many unbelievers and pagans.
His view is that among every kind of unbeliever, even pagans who do not know the one true God, there can be, and sometimes are, works of the moral virtues, though this happens rarely. Disputation 191, chapter 2.
Latin
XXVII. Quanquam ergo Doctor ille auxilium aliquod gratiae Christi necessarium putet, ad hoc ut aliquis bene moraliter operetur, nihilominus cum longe maxima Scholae Romanae parte, sentit gratiam illam in eum cadere posse qui fide destitutus est. Neque fidei nomine solum veram fidem in Christum intelligit, sed etiam qualemcunque unius veri Dei cognitionem, cujusmodi reperiri potest, non tantum in haereticis, sed etiam in infidelibus & gentilibus multis. Nam ejus sententia est, in quocunque genere infidelium, etiam gentilium, nec unum verum Deum cognoscentium, posse esse aliqua moralium virtutum opera, & aliquando esse, licet id raro contingat. Disput. 191. cap. 2.