Sure there is. Don't carry massive amounts of gold.
That's not an answer.
There are plenty of legitimate reasons people who play priests might need to carry large amounts of gold -- particularly if they are elders and need to fund a large temple expansion. And while perhaps priests shouldn't be able to act as couriers more easily than other nobles with troops -- though I think it adds to the game if they can -- they shouldn't be less able to do so.
And just what is 'massive' amounts of gold, anyways? For some, a couple thousand is a pittance. It certainly is for my priest. I'm a ruler, just wandering around in my realm I might suddenly have 'too much gold' because I didn't go turn my taxes into bonds for a while. And my realm isn't exactly the richest, and I don't have any income other than being ruler.
'Have less gold' is not a real answer to the question of how priests can manage their risk.
