What accusation is that? The Declaration of Independence makes it very, very clear where the signatories of that document believed our rights derive from. They may have been right or wrong, but that's what they believed, and had they not, they would not have pledged their lives, their fortunes and their sacred honor.
You may or may not agree with them, but again, that is what they believed and that is the premise upon which they declared this an independant nation.
Neither of us is going to resolve whether or not God exists, and I don't begrudge someone their personal beliefs; however, to dispute what the Declaration of Independence declares on the part of its signatories and to say that it doesn't say what it clearly says is at best disingenuous.
Just because someone doesn’t believe rights come from God doesn’t automatically mean they believe they come from big brother.