Tricky
Briefly immortal
Not according to Wickapedia.His name isn't Cat Stevens. It's Yusuf Islam.
Funny you should mention "mortal enemies". Yusuf Islam has chosen to make Rushdie a mortal enemy. That is not simply a disagreement. The only way to avoid becoming mortal enemies with Yusuf is to avoid blasphemy (which is, BTW, an asymmetric arrangement - Rushdie doesn't want him dead). Do you really feel that that's a tolerable restriction? Even if you don't want to commit blasphemy, I consider that incompatible with basic American values, and I'm disappointed to find out that you feel otherwise.
The singer attracted controversy in 1989, during an address to students at London's Kingston University where he was asked about the fatwa calling for the death of author Salman Rushdi. The media interpreted his response as support for the fatwa. Yusuf released a statement the following day denying that he supported vigilantism, and claiming that he had merely recounted the legal Islamic punishment for blasphemy. In a BBC interview, he displayed a newspaper clipping from that time period, which quotes from his statement. Subsequent comments made by him in 1989 on a British television programme were also seen as being in support of the fatwa. In a statement in the FAQ section of his web site Yusuf asserted that he was joking and that the show was improperly edited. In the years since these comments, he has repeatedly denied ever calling for the death of Rushdie or supporting the fatwa.
(And his name is actually Steven Demetre Georgiou)