Don't swear on it, read it!
I just wish that some of these people who believe they are doing God's work by forcing people to take a "so help me God" oath when joining Americorps would actually read the Bible sometime. I have served in two branches of the military and currently work in the federal government, but, each time I have to take the oath, I finish it not with "so help me God," but with "I do so affirm." Why? Am I an atheist? A rabble-rouser? No. It's because I actually take the Bible seriously.
"But I say unto you, Swear not at all; neither by heaven; for it is God's throne: Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King." - Matthew 5:34-35