I wonder if the turtles believe in life after death or in encountering some form of judgement when they die? Was any of that ever touched on in the comics, I can't remember excpet for this issue I think about Valhala or what ever.
Or for that matter I wonder if April or Casey have any religous beliefs that they practice? Each of them seemed pretty accepting of the turtles being chemically induced and not one of "God's creations".