Thematic Bible: Will finally judge

For all those people [i.e., Gentiles] who have sinned without [knowing] the law of Moses will also be lost without [knowing] that law. And all those people [i.e., Jews] who have sinned under [the authority] of the law of Moses will be judged by [the requirements of] that law. For [it is] not those who hear the law of Moses who are right with God, but [it is] those who obey [the requirements of] that law [perfectly] who will be considered right with God. (For when the [unconverted] Gentiles, who do not have the law of Moses, instinctively practice [some of] its requirements, they become their own lawmakers, even though they do not have the law of Moses. read more.
In doing this [i.e., practicing some of the requirements of the law of Moses], they demonstrate that these requirements are written in their hearts. Their conscience tells them this, and their thoughts alternately accuse them [of wrongdoing], or else endorse them [for doing right]). This will be done on the day when God judges the secrets of men's [hearts] through Christ Jesus, according to [the teaching of] my Gospel.