We've never observed any Creator creating life. Therefore that conclusion is not a scientific one.
Since we've never observed anything creating life, no affirmitive conclusion about the origin of life is "scientific."
You're really being sloppy here; we don't need to observe any creator creating life to come to such a scientific conclusion. We just need "overwhelming" evidence indicating that that happened. Evidence, for example, that supports evolution over timescales of millions of years--something else we haven't "observed" in the sense you're using here.
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