If he doesn't he will lose his daughter for a period of time, maybe a long one.
You just reminded me of something that happened years ago. I was dating a guy..he was nice, but he wasn’t what my parents were “hoping” for me. (honestly, it was about religion). I was with this guy for three years. One night I was visting them and we were having dinner. Out of the blue, my darling Father looked up from his soup and said, “Break up with Jeffrey.” It was so bizarre. Then, he never talked about it again! Thinking about it now, it must have been so hard for my Dad to do this beccause he loved me, and we were so close..and Jeffrey was a nice guy. Of course, I didn’t listen to him then. We eventually broke up and I married my hubby who my dad adored. PS: My husband is not of my religion either. As you get older, I guess this doesn’t matter as much!!!! lol!
As the father of two grown women and a grown son, allow me to retort:
A loving father will never cease speaking wisdom into the lives of his children. They're still free to choose but if I see one of then steering towards a ditch I will speak to the situation.