My honest reason for disliking the idea of God

[robvalue]

So supernatural means unexplained, then.

You also mentioned external. Something external to our reality, if such a thing is coherent, would I imagine be impossible to detect. If we can reach it somehow, then it seems similarly pointless to label it "another reality".

I don't know what an eternal god is, except that it's presumably eternal. Unless you define it, you'll just find more and more stuff, and people will each say "yes that's a god / no it isn't". And it will continue to mean nothing.

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Let's face it, anything real that ever gets found cannot be allowed to be a god. If it was, religion would end, as every theist utters a disappointed, "Oh".

The trick to god is making up whatever you want.