I keep hearing that like half the French team are Muslim but I seldom take such comments seriously because most of it is just rumours and hearsay anyway. As far as France goes Zidane would be the most obvious of the bunch but i doubt that he's much into religion or if he practices his religion at all. Some others like Ribery and Van Persie from Holland have married Moroccan girls and supposedly converted to Islam. While Nicolas Anelka was drawn to the religion during his time playing for a club in Saudi Arabia, and he (is said to have) influenced Thierry Henry as well.
Like I said I don't know how much truth there is to all that but you can take from it what you will.
Here's a brief list of Muslim Footballers and Managers which i got from
Wikipedia:
Zinedine Zidane
Franck Ribéry
Nicolas Anelka
Philippe Troussier (French coach)
Bruno Metsu (French coach of Senegal)
Khalid Boulahrouz
Robin van Persie
Zlatan Ibrahimović
Lee Woon-Jae (South Korean Goalkeeper)
Hakan and Murat Yakin (Switzerland)
Whole Saudi team
Whole Iranian team (with the exception of Adranik Teymourian)
Whole Tunisian team (apart from Jose Clayton and Dos Santos)
Many Ghanian, Togolese, and Ivorian players
....etc... etc.