No. I think it's tautological, but life is a necessary condition for the existence of an individual. (And yet, when life ends the individual ends, so can one truly say the individual experiences death?) I suppose you could say the concept of "inalienable rights" points to the wishful thinking that life is not a sufficient condition. Nature, red in tooth and claw, would disagree.
Anyway, you're position has been correct. The Founders, being rationalists, had no need to evoke the redundancy of a god or creator, as evidenced by their first draft. They fully understood that it was they themselves creating fundamental rights (I contend it's "out of thin air"). I said earlier that the inclusion of a higher authority was merely politically expedient, it includes that other government, the church.
Your point about the generic god inclusion as a political expedient is well taken.
However I don't agree they were creating inalienable rights out of thin air exactly, when the philosophy of inalienable rights is fundamentally grounded in the nature of existence itself, discovered through the natural ability to reason.

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