I would go with, not just no, but so unlikely that Sealion looks like a hopeful prospect in comparision.
In the mid to late 200s Christianity was just being noticed by most Romans. Before it had been a weird cult, like Wicca and Early Mormonism. Like such weird cults, the had an impressive conversion rate by percentage. Going from 1000 members to 2000 members is easy in 30 years. Keep it up for 150-200 years and you can build up some real numbers, like what Christianity did.
But that level of growth levels out at a certain point, where they become respectable like the Mormons, get percecuted as threat like Falun Gong in China, or just kinda hang out like the 7th Day Adventists and don't really grow because people feel like they heard your message and find the people who are knocking on doors....annoying. The fourth option is have things go just right and take over.
In the 250s and the late 290's Christianity had it's first real percecution. In both cases half the congregations defected (and mostly later came back), but in both cases they were fairly light and stopped shortly. Just enough to get them few martyrs to write legends about later. But the point is they were starting to get institutional push back and could have been pushed into non existence or becoming the cult of a few isolated villages like the Yazidis or Samaritians 1700 years after their heyday.
But Rome had a quirk. In that a lot of people, particularly socially influential people, would worship whichever Gods the Emperor favored. Imagine if 40% percent of Americans would have converted to Mormonism had Mitt Romney had been elected president. That's not something that happens in our society. Then you have 50 years of Christian Emperors and generations being brought up Christian at first because it's "respectable" and increasingly buying into the exclusivivity.
Eventually you get a Civilized=Respectable Romans=Christian. The Germans wanted to be seen as civilized and respectable so they drank the Christian kool aid as part of the package. If Christianity is not part of the package, that among other things, emphasizes Jesus as King of Kings (which is attractive to German rulers), and the Church as a transmitter of civilized culture, the attraction of Christianity is negligeble.