He's been one since the 70's
http://www.iiie.net/Brochures/Brochure-17.html
Cat Stevens
born Stephen Georgiou
changed his name to Yusuf Islam after converting to Islam
I guess the government doesn't think Yusuf Islam is actually riding the "Peace Train".
Then
Now
One of his tunes
http://www.dutchconnie.com/ASF%20Map...s%20Broken.asf