Question 406: Is a person who is ignorant of Tawheed (monotheism) excused?
Answer: A person is excused if they are not aware of the proofs or not informed of anything from the Prophet (peace be upon him). They take the same ruling as Ahl-al-Fatrah (people having no access to Divine Messages); they are tested on the Day of Resurrection. If they pass, they will be safe. If they do not, they will be doomed... read more here.