@AmbarAnak I'm still not sure I understand fully, but if your friend is worrying about the people who quote their religious beliefs, but don't have any meaningful advice for someone suffering from the doubt of whether or not he made the right choice, then it's not so much a question of good or evil, so much as sheep refusing to acknowledge that they have been blinded by their faith and don't know how to actually apply the lessons they should be learning from their religion.
In that case, I understand. Most people are useless in any situation that deviates from normal. Religious people simply tend to believe that they have the answers by quoting some line from a book they've probably never read themselves, but actually don't allow themselves to connect to the person they're talking to, thus negating the usefulness of any advice.
For your friend, that's rough. Is it your friend who lost use of his arms, or the kid he saved? If it's your friend, it's a noble sacrifice, but it would definitely be a difficult situation to be in afterwards. There's no one to blame, though as we see in the real world, heroes often get screwed in the end.
If it's the kid that lost his arms, it becomes a question of whether your friend made the right decision or not, yes? It can be difficult, but I would still argue that he made the right decision just based on saving the kid or not, not knowing anything else about the situation. If you're calling him a kid, he's too young to say 'eh, lived long enough', and life is worth living, even if it's challenging at times. It's the challenges that make the rewards later all the more valuable.
As for religious people being all high and mighty about everything, generally, that's the case, and that's why I try not to associate with anyone who feels the need to try to interject their religion into every topic. Less so if they can only parrot phrases, but not articulate or defend their actual beliefs in debate.