No, it is a figure of speech and it is pedantic to claim that it is about belief in any deity. It is similarly used in this context: "God gave you legs, now move your ass out of my way!" It is nothing more than a way to express the idea that rights are something people are born with, regardless of who is in power or what sort of government rules over them. That is how the founding fathers (another figure of speech, nobody is claiming that any of those men are any living person's father) used the term.