Jesus Christ, of course, is not dead. Titanic-man is just trying to make a buck now that the D'Vinchi code mania has cooled off.

But the other great "prophets" really are dead and buried, and have stayed DEAD. Here's two of them:

Mohamed's tomb in Medina:
http://en.wikipedia.org/wiki/Al-Masjid_al-Nabawi

Cremated Buddha, has tooth relic:
http://en.wikipedia.org/wiki/Relic_of_the_tooth_of_the_Buddha