The sentiment

I'm a fan of Cristiano Ronaldo.  Cette phrase est parfait.

It's my idole.  He's my idol.

I like his game.  (La phrase est correcte, mais peut-être un peu bizarre.  c'est mieux à dire "I like his style of play.")

His a beautiful man.  He is/He's a beautiful man.

He's was born the 5th February 1985.  He was born on the 5th of February, 1985.

I prefer him better Lionel Messi.  I like him better than Lionel Messi.

It's generous man, he is helping his country when he can.  He's a generous man.  He helps his country when he's able.  

He has a 4 children's (2 boys and 2 girls) He has four children/kids.  

My favorite team is REAL DE MADRID.  Cette phrase est parfait.

Even if he is no longer in the team.  Even if he is/he's no longer on the team.

I would like the team PORTUGAL win a next cup of the world but I enjoy a team French were the winner this years  I would like it if Portugal won the next World Cup, but I'm happy that France won this year.  

I dislike to play rugby.  I do not/don't like to play rugby.  

Salut, Severine.  Je suis américain, donc mon sport preferé est le baseball.   Nous jouons aux États Unis des sports très bizarres, non?

Bon études!