Help...

Wm started crying last night as he laid in bed, so I go in and ask what's wrong and he wails, "I don't want to die!"  No idea where this is coming from.  He tells me he's afraid it will be "pitch black and nothing" when he dies and that scares him.  He's got big, fat tears rolling down his cheeks.  So I'm panicking because he's clearly very upset and I have no idea what to say.  I start out with a speech about how he's very young and has a lot of years to live and when he's very old, he will be ready to die and rest.  Wm is not buying it.  I start wracking my brain.  So I go, "Well, did you know lots of people think when you die that something awesome happens?"  He finally stopped crying and looked interested.  I ask him if he's heard of God and he shook his head.  So I try to give him a basic rundown of God and Heaven and the afterlife.  FINALLY he seems a little bit comforted.  But I am not religious at all and don't know much beyond the very basic beliefs of any religion at all.  So I'm trying to figure out ways to explain what different religions believe to a 5 year old kid terrified of dying and needing to believe in a happy afterlife.  If anyone has anything...I'm all ears.  I've been searching for books online, but most are indoctrination-type texts, not really explaining the religion.  My plan is to just expose him to all the biggies and let him make up his own mind about what he believes. Any assistance with this would be greatly appreciated!