The antonyms for the word "non belief" are belief, faith, trust, confidence, assurance, conviction, and credence. Belief and faith refer to the acceptance of something as true or real, often without evidence or proof. Trust, confidence, and assurance involve a strong sense of reliance or certainty in someone or something. Conviction refers to a strong belief or opinion, often based on personal experience or evidence. Credence refers to the acceptance of something as true or valid based on evidence or authority. Each of these antonyms represents a different way of approaching knowledge and truth, and they can be used to express different attitudes or perspectives.