Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law. 15 They show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts sometimes accusing them and at other times even defending them.) Rom2:14&15
Also, Paul tells us if gentiles had never known of biblical law they can show the requirements(not some of the requirements) of the law are written on their hearts, obviously by the way they act. Do you agree with him?
Rom 2:12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
Rom 2:13 (For not the hearers of the law
are just before God, but the doers of the law shall be justified.
Rom 2:14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
Rom 2:15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and
their thoughts the mean while accusing or else excusing one another;)
Gentiles who never heard about the Ten Commandments cannot know all the requirements, or example Do not to make idols, and remember the sabbath, how could someone who never heard about these keep these 2 commandments, people are very different from one another but God do see their hearts and he Knows everything. Do you think God would judge someone for not keeping the sabbath if this person never ever heard of it?
Obviously you have to accept that not everyone have the commandments of God written in thir hearts, many still refuse them, God will not force anyone to do His will if they do not want to. we have free will and God gives a choice, jesus spoke of he wide easy path and the narrow difficult path. jesus explained all this see below
The Parable of the Sower – Matthew 13:3–9,18–23
Jesus said:
3 “Behold, a sower went forth to sow;
4 And when he sowed, some seeds fell by the way side, and the fowls came and devoured them up:
5 Some fell upon stony places, where they had not much earth: and forthwith they sprung up, because they had no deepness of earth:
6 And when the sun was up, they were scorched; and because they had no root, they withered away.
7 And some fell among thorns; and the thorns sprung up, and choked them:
8 But other fell into good ground, and brought forth fruit, some an hundredfold, some sixtyfold, some thirtyfold.
9 Who hath ears to hear, let him hear.”
Jesus explained:
18 “Hear ye therefore the parable of the sower.
19 When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart. This is he which received seed by the way side.
20 But he that received the seed into stony places, the same is he that heareth the word, and anon with joy receiveth it;
21 Yet hath he not root in himself, but dureth for a while: for when tribulation or persecution ariseth because of the word, by and by he is offended.
22 He also that received seed among the thorns is he that heareth the word; and the care of this world, and the deceitfulness of riches, choke the word, and he becometh unfruitful.
23 But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.”
and
Mat 7:12 Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.
Mat 7:13 Enter ye in at the strait gate: for wide
is the gate, and broad
is the way, that leadeth to destruction, and many there be which go in thereat:
Mat 7:14 Because strait
is the gate, and narrow
is the way, which leadeth unto life, and few there be that find it.