HE'S SO UNPREDICTABLE
They think He's like the weather in Ohio - warm and sunny one day, cold and rainy the next day
They think He likes to mess with them, just for fun
They think He likes to find out what they want, then do the opposite
They say things like "man proposes, and God disposes" or "the best-laid plans of mice and men gang aft a-glay" - meaning that it's useless to make long-term plans because God will usually mess them up