Far below the demands to 'release ALL Muslims from prisons', thank goodness.
I think they knew they had no chance with that one. It was just for show.
However, don't underestimate the propaganda value of these guys' "conversion," retracted or not. A lot of Islamic warfare seems to be conducted by bragging, boasting and taunting, or at any rate doing so to encourage the faithful to then go on to the hard stuff, like blowing themselves up.
My forecast - and I hope I'm wrong - is that kidnappings will go up, and a demand for "conversion" will become a standard part of them. But really, there's no downside for the Muslims. The kidnappers never get punished in any way, they usually get a bit of money out of the deal, and Al Jazeera get all sorts of juicy propaganda videos.