If USA is a free country then why does it represent "god" on its currency?

Then don't spend the currency; give it to me. The motto on the currency does not in any way infringe upon my freedom. Since I am not ordered to worship the currency, there is no implication that I believe in God. I am not using it for a religiou purpose. It is simply a medium of exchange for me. For all I care, they can put Sponge Bob on it.