Restorationism
belief that the beliefs and practices of early Christianity were lost or adulterated and required restoration
en-US/ˌɹɛstəˈɹeɪʃəˌnɪzəm/
en-GB/ɹɛstəɹeɪʃnɪzəm/
belief that the beliefs and practices of early Christianity were lost or adulterated and required restoration