Dean said that he gave up AA for Lent, and Sam said that they weren't catholic.
Also, as Missyjack reminded me, John's dog-tags said "non-religious" - so the boys were most likely raised atheist, but Sam was probably influenced into praying by Pastor Jim.
The death thing: I think they just had to die the same way they themselves had caused suffering...so the dude who ran over the little girl was run over, and guy who hurt dogs was hurt by a dog, and Dean was set to die in an explosion because Jo died in an explosion (I guess it would be too complicated to determine how he would die because of his guilt over failing Sam.) And, someone else pointed out that his guilt over Amy isn't really about killing Amy, it's about lying to Sam about it.
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Also, as Missyjack reminded me, John's dog-tags said "non-religious" - so the boys were most likely raised atheist, but Sam was probably influenced into praying by Pastor Jim.
The death thing: I think they just had to die the same way they themselves had caused suffering...so the dude who ran over the little girl was run over, and guy who hurt dogs was hurt by a dog, and Dean was set to die in an explosion because Jo died in an explosion (I guess it would be too complicated to determine how he would die because of his guilt over failing Sam.) And, someone else pointed out that his guilt over Amy isn't really about killing Amy, it's about lying to Sam about it.