LU, as stam yainam is a rabbinic prohibition (as are the disabilities on non-observant Jews) a safek is l’kula (and here it is a d’rabbanan within a d’rabbanan). Certainly if you are in a situation where you might push the person further away you should be meikal. If you google “non-observant Jews wine” you will get a number of articles on the subject.
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