The antonyms of "disbelieving" are "believing", "trusting", "accepting", "relying", "crediting", "confiding" and "having faith". These words essentially mean to have trust or confidence in something or someone. Believing refers to holding an idea or a concept as true or real. Trusting means to have confidence in the reliability of a person or a situation. Accepting means to acknowledge something as true or real even if it is not desirable. Relying means to depend on something with full trust or confidence. Crediting means to believe in something without any doubt or hesitation. Confiding means to entrust one's secrets or beliefs to someone with complete faith. Having faith means to trust or believe in a higher power or an entity beyond human comprehension.