The Roman Gods do not actively recruit from the greater population. In a past post, I recounted how I was recruited into Polytheism by Odin, the Norse All-Father. (Why Neptune’s Dolphins?) After following the Norse Gods for some time, Neptune of the Romans showed Himself to me. Since then, I have encountered people who have become Roman Polytheists after being Norse. They said it was a natural progression from the “harsh” Gods to the more “orderly” Ones. Different pantheons have different expectations of their followers. Roman Gods prize order and structure, whereas the Norse are comfortable with chaos.
Since there is overlap with Greek Gods in many people’s minds, the Roman Gods would rather leave the followers of the Hellenic Gods alone. I have noticed that conflation occurs for various Gods such as Poseidon and Neptune in discussions about Gods in general. Recognizing the differences between the Two Gods can be difficult.
Moreover many Celtic followers are resistant to Roman Gods because of the Romans’ war with the Druids. There are Celtic-Roman Gods such as Sulis but their worship does not seem to extend to Roman Gods. Then there is the “coolness” factor of the Norse and Celtic pantheons which people find exciting. Perhaps this is because of all that exposure that people have to Greco-Roman myths and none to these other pantheons.
In my observations, Roman Gods refer people who are already practicing Polytheists. From my experience with Roman Polytheism, it requires daily and regular practice. Since These Gods are “Romans,” They do prize organized over ad hoc devotions. Perhaps that is why the Roman Gods are more reluctant to actively recruit, since many Pagans have eclectic practices.