Can you show me where the WT has said that creating life from non-life is "theologically" impossible for humans?
Read it for yourself, page 6. It's talking about humans making life from non-living matter. It's the whole point of the discussion.
https://download-a.akamaihd.net/files/media_books/d0/lf_E.pdf
See also the Creator book page 37 that talks about scientists attempting to create life from non-life. It does not say it is theologically impossible. Instead it asks the question:
If the gas mixture represents the atmosphere, the electric spark mimics lightning, and boiling water stands for the sea, what or who does the scientist arranging and carrying out the experiment represent?
JWs argue that the chances of life arising from non-living matter spontaneously are remote, they do not say it is theologically impossible. They allow for the possibility that scientists may manage to do it some day, but they argue this only goes to prove that intelligent beings need to set the conditions for it to happen.
Your thread is based on a misunderstanding of what JWs teach.