The Problem with Christians

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Natural explanations cannot account for them yet.

That doesn't mean they never will; and even if they don't, it doesn't mean there aren't still natural causes that we aren't able to model.

If "supernatural" just means "outside current scientific knowledge" then something can be supernatural today and natural tomorrow. That's a pretty pointless and loaded way of describing something that is simply as yet unexplained.

Jumping to an unsupported conclusion like this in absence of definitive evidence is called the argument from ignorance fallacy, which I explain on my website here.