The Roman Gods do not actively recruit from the greater population. I was recruited into Polytheism by Odin, the Norse All-Father. 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 “chaotic” 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.
The Babylonian Gods have a problem in attracting many followers. They and the Canaanite Gods are often first encountered in a negative light in the Old Testament of “The Bible.” Therefore, it is hard for the average Pagan to want to know any of these Gods since they associate Middle-Eastern Gods with Christianity. Also, the Old Testament treats these Gods as figments of people’s imaginations. For these reasons, Marduk, Nanna, and the other Gods do not seem as “real” as the Egyptian Gods. Often the Babylonian Gods will fade into the background.
Another problem for the Babylonian Gods is the meme set forth by the late Zecharia Stichin that the Anunnaki are space aliens who created humans to be their slave species. Stichin took various Babylonian myths and re-invented them to fit his theories. These aliens come from the planet Nibiru (“the 12th planet”) which supposedly passes by Earth every 3,500 years. At that time, they come to earth to bedevil humanity. The meme goes downhill from there and into ancient astronaut theories and alien-human hybrids.
The popularity of Inanna (Ishtar), the Goddess of Love and War often impede people from knowing the other Babylonian Gods. (A popular chant includes Her Name with others Goddesses.) The Pagan devotion to Inanna is often divorced from the other Babylonian Gods. Usually, it is centered in Goddess Worship, whose followers see the Goddesses as individuals and not rooted in particular pantheons. Therefore, Inanna becomes attached to Isis and the other Goddesses.
The devotion to Inanna does not usually transfer to the other Babylonian Gods. This is in contrast with Isis and Hecate, who followers will become acquainted with other Gods from their respective pantheons. I think it has to do with the Babylonian Gods Themselves. More formal in their relations with humans, these Gods expect a sense of propriety from their worshippers. Moreover, They want to be their worship to be rooted in their culture, which makes These Gods reluctant to deal with Eclectic Pagans.
My experience with the Babylonian Gods came from studying mythology and comparing various myths to popular culture. At that point, Marduk decided that I understood the “Enuma Elish,” the Babylonian Creation Epic. From intensive studying of that epic, I developed a devotion to this pantheon. The Babylonians, from what I can infer, prefer people who have little or no Christian residue, and are willing to take their myths seriously.