Science restricts itself to the natural because that is about all we can know with what we think is certainty, and can agree amongst ourselves that we know.
It is even broader than that. Science relies on observations. If a deity had a discernable and observable effect on the world around us then it could be a part of science. It is not the fault of scientists that no one can show how deities have any effect on the reality around us.
What Heissonear is complaining about is that we don't put as much weight on faith based claims as we do on evidenced based claims.
Supposing you did get a signal from out there. You still need to be able to interpret it. How can the rest of us, including other supernaturalists know that your interpretation is correct? How can you, for that matter, know that you have it correct, particularly in the case of other supernaturalists who might disagree with you?
Apparently, it is determined by how many followers you can get.
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