The same criteria you use to determine intelligent design in everything else that doesn't involve a creator of the universe.
Which is observing factual evidence of the designer working using strictly natural processes, and using that to draw a distinction between things they design and things which come about without their help.
So where can we watch your god designing stuff? And what didn't it design so we can look for the differences between god-designed and non-god designed stuff? Seems that unlike cases where we look for human design these are all open questions.
Probably why ID proponents keep losing court cases where they try to convince people they're doing science.
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