Golfer…………….
I have a sister in law whose nephew (no blood connection to me) was brought up in a Conservative Jewish household. He observes Shabbos, keeps kashrus according to the standards set by the United Synagogue of America, graduated JTS and is a Conservative pulpit rabbi.
He is not frum, but to call him non-observant is pejorative. He observed the law according to the rules of his movement. He is Jewish, not frum.
That’s why I disagree with the term.
If he observed no ritual/belief then he’d be non-observant