The cross and the presence or lack of Christian influences

[MarcoP]

One exception I can think of is that of "souls", in heaven or hell. Those are nude to show that they have left their earthly garb (and possessions and status) behind.

So this implies that the nymphs, taken as a whole, are either of pagan descent or "souls". Or both.

Now this is a peculiar line of reasoning. "I can only think of paganism or souls, so it must be either paganism or souls".