Long answer: Syncretism did a lot of the heavy lifting for us. Even after the Roman Emperors converted to Christianity, the rise of another faith didn't diminish us.
Theodosius made things a little more complicated. Our followers having to go into hiding forced us to operate out of sight of regular, non-demigod mortals. We never really came back from that, even after the Renaissance granted us a resurgence.
But another pantheon existing alongside us isn't an issue, as long as there's still an active culture surrounding us.
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Long answer: Syncretism did a lot of the heavy lifting for us. Even after the Roman Emperors converted to Christianity, the rise of another faith didn't diminish us.
Theodosius made things a little more complicated. Our followers having to go into hiding forced us to operate out of sight of regular, non-demigod mortals. We never really came back from that, even after the Renaissance granted us a resurgence.
But another pantheon existing alongside us isn't an issue, as long as there's still an active culture surrounding us.