Final answer:
Ancient Roman religious practices featured both traditional public cults and mystery cults, with the latter offering secretive rituals and promises of personal salvation which set them apart from traditional civic religion.
Step-by-step explanation:
The religious landscape of ancient Rome included both traditional Roman religion and various mystery cults, each appealing to the populace in different ways. Traditional Roman religion and mystery cults like those dedicated to Mithras or Isis shared the feature of communal rituals. However, mystery cults added layers of secrecy and a hierarchical structure of initiation, along with promises of personal salvation or spiritual immortality, which were not emphasized in the public practices of traditional Roman religion. Mystery religions also integrated elements of magic and esoteric knowledge, setting them apart from the more established civic traditions. Furthermore, many mystery cults integrated into Roman life without necessarily posing a threat to the emerging Christian faith or the more traditional public cults, though Christianity did eventually become a state religion under Emperor Constantine.