Surely it would have been Thor that did the lightning anyway.
http://en.wikipedia.org/wiki/Thor
I just had a thought.
Maybe everthing worked fine when all the original Gods were respected and each made to feel important by their worshippers. Unfortuantely a certain Hebrew war god strarted getting all the attention and got way too big for his real power.
You see this in people like Hitler who actually did have some good ideas until he got carried away with his own sense of self importance. Once God started claiming power over everything the other gods decided they were not going to to trick for His glory yet is unable to doing anything impressive on his own.
Yes that all makes sense. Gods are true and used to work as per the documentation. They all got along fine and helped with each other's acts until then. God is like the kid at school who can't do anything impressive himself but thinks he is powerful through the guys he hangs with. One day they get over it and the pathetic upstart is left to bask alone in their myth of superiority.
It is as good or better hypothesis than the idea that we all went bad and God doesn't like us any more. Lets face it if God really could do impressive tricks he wouldn't be able to help himself. If there was some way of getting compete support from humanity He would jump at it. That is clear from His nature as described in the Bible. Self obsessed, jealous and incredibly vain.