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You don't know the origin of DNA, so it is presumptuous to assume that the origin is natural.
We don't know the origin of the gravitational force. Is it presumptuous of us to assume that gravity in natural?

It may or may not be. Things that can be demonstrated to be natural should be assumed to be natural I suppose.

Which begs the question, how does one demonstrate that something is natural?

You've taken my statement out of its context. Seems to me Centromere wants to answer the question "Does DNA have a natural or an intelligent origin?" by saying, in effect "Why don't I just say its natural, declare victory, and end the discussion?". I generally don't accept assuming what you are trying to prove as a valid argument.

I don't think you're following Centromere's argument. I think that Centromere is drawing a parallel to demonstrate the flaw in your reasoning. As I understand them, your and Centromere's arguments are, respectively:

1) Human intelligence is the only proven way to create DNA [genomes], therefore intelligence is the most likely explanation for DNA.

2) DNA predates the only proven form of intelligence, therefore the non-intelligent (natural) is the most likely explanation for DNA.

Both statements have a problem. The first requires evidence for an intelligence that existed at the time DNA was created. The second requires evidence that DNA can be produced by a natural mechanism.

What we're basically talking about is abiogenesis. The rational for assuming a natural cause for DNA is that it permits one to create and test hypotheses. Indeed, a variety of experiments have demonstrated the spontaneous (i.e., natural) production of various aspects of what one might expect to occur to produce the first form of life on Earth (for instance, see the review: Progress in Biophysics and Molecular Biology Volume 81, Issue 3, April 2003, Pages 201-217). So, although we may not have a complete model going from abiotic to biotic systems, we may have some parts of the model.

Assuming an intelligent origin for DNA is a dead end. It doesn't, as far as I can see, provide any hypotheses that can be tested scientifically.

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