The virtuous gentiles were saved, judged according to the law written on their hearts as St. Paul says. Here is a quote from a Church Father, it is consistant with the other Church Fathers:
From St. Justin Martyr
We have been taught that Christ is the first-begotten of God, and we have declared him to be the Logos of which all mankind partakes [John 1:9]. Those, therefore,** who lived according to reason [Greek, logos] were really Christians, even though they were thought to be atheists**, such as, among the Greeks, Socrates, Heraclitus, and others like them. . . . Those who lived before Christ but did not live according to reason [logos] were wicked men, and enemies of Christ, and murderers of those who did live according to reason [logos], whereas those who lived then or who live now according to reason [logos] are Christians. Such as these can be confident and unafraid" (First Apology 46 [A.D. 151]).