Question about innocent people and idolatry.

[Director Michael]

Is sin (defined for Gentiles) limited to transgression of one of the 7 Mitzvot or is sinful behavior inclusive of actions (inaction) outside the 7 commandments?

This is answered by a passage in the author's introduction to the book "The Divine Code":

"In addition to observing the Seven Noahide Commandments with their many details, a Gentile is commanded to act in the proper ways that human intelligence would compel him, whether these are obligations to G-d or to other people, or to society as a whole. Even though Gentiles are not commanded in detail about these parameters of proper conduct, nevertheless, G-d carefully checks and judges all the ways of every person. There are actions for which the individual or the society is liable to be punished, since such behavior is not appropriate for the human race, even though it is beyond the scope of the Seven Commandments."

Is a Gentile responsible for his/her sins of idolatry & teaching others to be active in idolatrous worship when he/she was ignorant of Hashem's covenant with Noah and his descendants and their obligation to fulfill the 7 Mitzvot?

Once a Gentile becomes aware that he has committed these sins in error, he should sincerely repent from his belief and involvement with idolatry, and G-d will forgive. Once can look to Jethro in the Book of Exodus. He was a priest for all known forms of idolatry at that time, but then after he fully rejected all idolatry and repented, and henceforth served only the One True G-d, he was beloved by G-d and he merited to have an entire portion of the Torah named after him - the portion that includes G-d's speaking the "Ten Commandments" at Mount Sinai.