Information on them is a little scarce, but the Hypsistarians appear to have been a Jewish-influenced monotheistic sect in Asia Minor from the second century BC to fourth century AD, worshipping the Hypsistos ("most high god", possibly a merger between Zeus Sabazios and Yahweh Sabaoth). They followed some Jewish customs (Sabbath, kosher) but not others (circumcision), and followed some pagan customs (worshipping fire/light/sun/earth?) but not others (idol-worship? these sources, man).
Do the Hypsistarians have any potential to become a bigger religion? How might that happen and what might that look like? I'm particularly interested in how they might fare in a world without Christianity but that need not necessarily be so.
Do the Hypsistarians have any potential to become a bigger religion? How might that happen and what might that look like? I'm particularly interested in how they might fare in a world without Christianity but that need not necessarily be so.