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Why does it have to be nonexplanable by science?

Cause otherwise we would call it stage magic

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An alien from a society ten thousand years ahead of ours can do that. It doesnt take a God, as it wouldnt make them Gods simpyl because they can do things beyond our know-how or understanding.

You are absolutely correct. That's why I was careful in talking about "powerful entity" here. I don't think you can get physical proof for the existence of a god, all you could get is physical proof for the existence of an entity that has a lot more knowledge than we do. It's a minimum requirement if you will.

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they dont have to be capable of "magic" to be the one responsible for all things.

Well if you are claiming to be responsible for all things then I would expect you to at least mess with some physical laws. Whether you also need to be able to go against logic or not is a subject for a different thread. (Curiously enough theologians seem to agree that god can not do what is logically impossible, though I don't know why they do).