"The caduceus is the traditional symbol of Hermes and features two snakes winding around an often winged staff. It is often used as a symbol of medicine, especially in the United States, despite its ancient and consistent associations with trade, liars, thieves, eloquence, negotiation, alchemy, and wisdom".
Wikipedia
Ima just guessing here, but maybe God doesn't like one of His identifying with liars and thieves or fake ancient gods?
Or using that as a symbol, when that symbol should be a Cross?