If I may give my vision on this:
Of course please note that this is MY opinion and trains of thought, and I don't mean to bash or offend people or get into heavy discussions. I just want to present another viewpoint!
I was raised in Protestantism, and later on I started doubting religion and we kinda stopped going to church (also because my parents were in a divorce, my dad still goes to church every sunday but I've always lived with my mother, so yeah). To me religions are just... stories that got passed on and blown out of proportion. People love exaggerating stories, always have. If one person back then could swim, then a few decades later he'd have been walking on water. Get what I mean? I don't mean to bash on religion at all, though. I think it's a good thing for people who need it, as long as they aren't too radical, you feel?
I don't believe that any god would want the beings they created to suffer. I do believe angels and demons exist, though. I just don't see them as really religious or from a religious viewpoint, but more as beings that kept everything in some kind of balance. And while I do think that demons are more "bad" and angels are more "good", I don't believe for a second that angels are all that pure and innocent, and that demons are all evil and merciless. I think both of them have good, as well as bad traits.
As for ghosts, I'm certain they exist. At times I could swear that there is someone standing behind me to my left, and when I turn around there's nothing there. This has even happened when it would be physically impossible for someone to stand behind me, as they'd be standing in a wall in that case. There has also been once when I was in bed listening to music and suddenly I spotted ?? something out of the corner of my eyes, and it jsut flew over me. After that the volume of my mp3 player started acting really weird, getting louder and softer without me doing anything, and I was terrified.
I have also known and been friends with several persons who could see ghosts, and one of them has even been attacked by one and was stabbed in her back.
Luckily not anything physical, but according to her it might as well have been because it sure as hell felt like it was an actual knife. So yes, I do most certainly believe in ghosts.
On my view of the afterlife or what happens to you when you die, I don't have a single clue. Of course there's the Tunnel theory and all, and I think it does hold some truth. I mean so many people have seen it, been through it. There must be some truth hidden in there. But I'm also skeptical. The human mind is extremely powerful, and can let us see, hear and feel things that are not there. I mean the presence I felt behind me might have been my mind playing tricks on me, I don't know that. But in the end I believe what I'll see my loved ones again who died before me and that we'll all be in another world, in a good world. I also think that when you die, truly die, that you'll get to know everything you ever questioned, from philosophical and existential stuff to "how big is the universe" and "Is my dog gonna be okay". Writing it down like this kinda makes me think again, to be honest. Am I believing in fairy tales? Again, no clue. But if I'd have to make a guess that'd be my guess. But until then, I guess I'll cross the bridge of afterlife and death when I get to it (haha yes sorry terrible pun).
I also believe that there are other supernatural creatures out there and/or deities that we don't know about. I don't know what is out there exactly (and I almost don't dare to guess), but especially in our oceans there must be something, we've discovered so little. I also believe there's life outside our solar system and all, but they probably can't travel to us or are so far away that they still see the dinosaurs walking around on our planet. Or they aren't interested, or they're in another space pocket and can't interact with us in any way. I have no idea. But we can't be the only ones.