Others can be kept outwardly without saving grace: Ames and Melanchthon
Thesis III. They agree no less that corrupt man can keep certain precepts of the law without the saving grace of Christ, at least absolutely and as to the matter of the work. This can be seen in Ames's Bellarmine Disarmed: 'We also grant that a man without faith, with special help and even without it, can perform some moral good, if "perform" is taken to mean doing the work considered in itself, without regard to the principle it flows from and the end to which it ought to be referred' (book 4, On free choice, chapter 3).
What Melanchthon teaches in the Apology of the Augsburg Confession agrees with this: 'The human will can in some measure achieve civil righteousness, or the righteousness of works. It can speak of God, offer God a certain worship by outward work, and obey magistrates and parents in choosing an outward work. It can keep its hands from murder, adultery and theft.'
Latin
III. Nec minus in eo consentiunt, sine gratia Christi salutifera posse quaedam legis praecepta ab homine corrupto, saltem absolute & quoad operis materiam, servari. Id videre est apud Amesium in Bellarmino enervato. Concedimus etiam, inquit, posse hominem sine fide, cum auxilio speciali & etiam sine illo, bonum aliquod morale perficere, si perficere accipiatur pro effectione ipsius operis in se considerati, sine respectu principii a quo fluit, & finis ad quem referri debet, lib. 4. de libero Arbitrio capite tertio. Quibus consona sunt quae tradit Melanchton in Apologia confessionis Augustanae. Potest, inquit, humana voluntas aliquo modo efficere justitiam civilem, seu justitiam operum. Potest loqui de Deo, exhibere Deo certum cultum opere externo, obedire Magistratibus, parentibus in externo opere eligendo. Potest continere manus a caede, ab adulterio, a furto.