I'm not French, I'm not telling people that I am. (Although I do love to pretend that I speak French.) But I do feel like the national team is my team in the same way that Juve is my team. I don't know why or how, it's just the way it is. I realize that originally the idea was that every person had precisely one nationality, in times when travel and living abroad was very rare. But it no longer is. I've lived my life in 3 countries so far, who knows there may be more.
Also, I've always felt a certain attraction to France, the country, the language, the culture. Never lived there but always felt that if I had I would feel good. In fact, if I hadn't botched my French education in high school I would definitely have gone to college in France instead of here.