I don't have a problem with the Serenity Prayer. I do cringe at the Lord's Prayer at the end. Just too Christian. I only pray to Jesus when I am worrying if my direct deposit will hit.
I know Bill W. wrote that the Lord's Prayer wasn't a contradiction in the "god of your understanding" thing, but what if a Jew or Muslim is in the room? It is clearly a Christian prayer and it rubs me the wrong way, too. It takes for granted that to buy into spirituality you have to have a Christian concept of a Higher Power. Frankly, it sucks.
But to the OP, don't let it bug you. Latch on to the positive things in the room at the meeting, the fellowship, etc. And as others have suggested, I think you don't have to stray far in the rooms to find others that feel the way you do.