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[oshfdk]

I doubt there were any Jupiter worshipers in the 15th century. Classical antiquity was a huge source of inspiration for the Renaissance, but always in a Christian framework.

Interestingly, I looked up whether there were any attempts of restoration of the Greek or Roman religious or cultural traditions in Europe, and immediately found the following two examples:

1) Gemistos Plethon ~1355 - ~1452, contemporary of the VMS vellum, You are not allowed to view links. Register or Login to view.
Advocated for the restoration of the Greek worship and traditions, created a secret book called Nomoi.

2)  Julius Pomponius Laetus 1428 - 1498, You are not allowed to view links. Register or Login to view.
Studied Roman traditions, also had a kind of secret academic club dedicated to all things Roman

So, it's not that impossible for some Roman or Greek cult to operate in secret in the XV in Europe. And if they needed to create a book that talked about their values or deeds, it would have made sense to use a cipher and obfuscate the imagery.