So it was only Israel that were sinners? If the other Nations didn't have the law, sin wasn't counted against them.
I find there were warnings to the pagan nations who became involved with ancient Israel.
Egypt would be one example. The people were forewarned but many chose Not to side with ancient Israel.
Please notice besides Pharaoh there were Egyptians who sided against Israel as found at 1 Samuel 6:6.
It would seem, that after the warnings, their deliberate sins could possibly be held against them.
In other words, there might be No future resurrection for them.
According to Scripture we pay a price for sinning. The price tag that sin pays is: death - Romans 6:7; Romans 6:23.
So, since sin and death spread to everyone through father Adam, then all sin.
As far as sin being counted against them: Their death then stamps the price tag of sin as being Paid in full.
As Romans 6:7 says that ' death ' frees or acquits a person. So, just as a governor can pardon a person so the crime charges do Not stick, Jesus can pardon a person so the sin charges do Not stick.
Since we can Not resurrect oneself or another, then we need someone who can resurrect us.
Jesus can and will resurrect mankind because Jesus has the keys to unlock death according to Revelation 1:18.
There is an 'unforgivable sin' that is Not covered by Jesus' ransom for mankind as mentioned at Matthew 12:32 and Hebrews 6:4-6. That is why Matthew 20:28 says Jesus' random covers MANY and does Not say All.
I think you might find Acts of the Apostles 24:15 to be of interest because it mentions there are two (2) classes that will have a future resurrection. Both the righteous people and unrighteous people. That would include people of the Nations who did Not have the Mosaic Law. According to Psalms 92:7 it is the wicked who will perish (be destroyed) because they refuse to repent as mentioned at 2 Peter 3:9. A person would have to be forewarned in order to repent. The times of ignorance is now past according to Acts of the Apostles 17:30-31.
As far as those people of the nations as mentioned above, please note Revelation 22:2 because there it says mankind will see the return of the Genesis ' tree of life ' on Earth for the purpose of healing for earth's nations.
Jesus will fulfill Revelation 22:2 which is in connection to God's promise to father Abraham at Genesis 22:18; 12:3 that ALL nations of Earth will be blessed. Blessed with the benefit of healing for earth's nation(s).