we're too assume the other girl (suicidal girl) goes back to reality/ wakes up... but there is no confirmation beyond them talking about it and her bringing back objects.
Pretty much the moment she says "if you see God, tell him to go $!#* himself" you know, unambiguously, that she is, in fact, sending her to heaven. The minute a sinner enters heaven, all of the afterlife ceases to exist. All people in hell poof out of existence, all those alive will simply cease to exist when they die.
They spoon fed all of that to the viewer throughout the film, and then, in case the viewer was really, really slow on the uptake, they flashed back to every singly expisitory bit of dialogue right there at the end. If it felt ambiguous even after the remedial flashbacks, I honestly don't know how to help.
Movies are IQ tests; the IMDB boards are how people broadcast their score.
There is the son of God to save us from our sins and go to Heaven when we die. He's not mentioned in this. I was years ago going to Christmas Eve service.