[Note:- I am rephrasing my question as otherwise my question will be closed; so the warning says.]
Do those who do not have the Law of God with them perish straight? That is what the Scripture says in Rom 2:12. That means there is no salvation without Law.
The Scripture also says that it is the “doers of the Law” that will be justified (Rom 2:13) and not the hearers. If the hearers are not justified then those who have never heard or known God’s Law also will not be justified! Without hearing or knowing the Law, they cannot be doers because the spiritual law is spiritually discerned.
But how will the natural man of the world do the spiritual law because “a natural man (the unconverted mind) does not receive the things of the Spirit of God, for they are foolishness to him, and he is not able to know them, because they are spiritually discerned” (1 Cor 2:14).
Again the Scripture says, “And so people become enemies of God when they are controlled by their human nature (the unconverted mind); for they do not obey God's law, and in fact they cannot obey it” (Rom 8:7; GNB).
The unconverted human nature “is stupid, disobedient, foolish, a slave of all sorts of desires and pleasures, evil and jealous, hating” (Tit 3:3).
Premise 1: The Scripture says that no one is righteous in the ultimate sense (except Jesus). At one time or another, all humanity has sinned and fallen short.
Romans 3:9-18
9 What then? Do we excel? No, in no way; for we have before charged both Jews and Greeks all with being under sin, 10 as it is written: "There is none righteous, no not one; 11 there is none that understands, there is none that seeks after God." 12 "They are all gone out of the way, they have together become unprofitable, there is none that does good, no, not one." 13 "Their throat is an open grave, with their tongues they have used deceit, the poison of asps is under their lips; 14 whose mouth is full of cursing and bitterness;" 15 "their feet are swift to shed blood; 16 destruction and misery are in their way, 17 and the way of peace they did not know." 18 "There is no fear of God before their eyes."
Premise 2: The above whole sinful humanity is bifurcated into two groups by the same Scripture: Those who have sinned within Law and those who have sinned without Law.
Romans 2:12
For as many as sinned without Law will also perish without Law. And as many as have sinned within Law shall be judged through Law
Question: Since according to Romans 2:12, whoever sins without Law straight perishes also without Law it becomes logically clear that there is no Salvation without Law!. There is no mention of conscience here.
The only hope is for those who sin within the Law because there is a judgment for them. In that judgment, they either get convicted or acquitted.
So, how can one say there is salvation through faith alone apart from God’s Law?
Clarification 1: Romans 2:21-23 shows clearly that by Law Paul meant the Ten Commandments which are “holy”, “just and good” (Romans 7:12), and “spiritual” (Romans 7:14). Since they are spiritual, they cannot be intellectually discerned by a natural unconverted man.
Clarification 2: Also, unlike the secular definition, the Scriptural definition of sin is this: “Whoever sins is guilty of breaking God's law, because sin is a breaking of the law” (1 John 3:4; GNB).
Clarification 3: True, Paul talks about the Gentile Christians and their consciences (Romans 2:14). But these are those “who show the work of the Law written in their hearts” (verse 15). So these are the true Gentile Christians who do “the things of the Law” (verse 14) which were written in their hearts and minds by God as per the New Covenant (Hebrews 10:16). They are not pagan Gentiles who do not know about God’s Law!