The spirituality presented in LOST was not by any means, theologically correct. That’s not really a criticism because I know it is fantasy. However, the “moral” of the story, and perhaps of the series as a whole is basically the idea that we can’t make it on our own. We need other people.
Interestingly enough, this is a theme that has been in a few sermons at my church lately. God built us with the need for other people. In 1 Samuel we see the friendship between Jonathan and David and the importance of people having someone they can lean on. God said that it was not good for man to be alone, that he needed a helper. Ecclesiastes talks about the value of people not going at it alone.
Christianity is not meant to be an individual lifestyle; it should be something done in groups. Sure, there should be time for one-on-one with God; we see Jesus do that when he goes out into the desert. But several times throughout the Bible we see people relying on other people in their individual walk, such as Elijah and Elisha, Paul and Silas, David and Jonathan, Jesus and his 12 disciples (I believe Peter and John were the ones especially close to him, but I’m not completely sure).
The LOST series culminates as the writers put forth the idea that we should not try to go through life alone. In the episode leading up to the finale, the ghost of Jacob meets the candidates and tells them what they must do. In the conversation Jacob points out that these candidates were chosen because they were alone like Jacob was; their life apart from the island was not so fantastic as they lived primarily solitary lives.
In the LOST finale, we see this moral of the story in full force. We see Jacob, the old protector of the island who lived alone (aside from his pesky twin brother the Man in Black) contrasted with Hurley, who is the new protector of the island. Hurley realizes he cannot do it himself and asks Ben to be his number 2. Additionally, we see that the Flash Sideways Timeline (FST) was in fact a type of purgatory in which the characters of the series lived out their previous lives as if the island never existed. Certain events happen so that many of the main characters of the series (many who had died earlier in the series in the Original Timeline (OT) ) remember their past life on the island and they all end up in a single place together, which happened to be a church. The main point of this FST was that the characters would transition to the afterlife together, reuniting with the people who were most significant in their previous lives.
The LOST finale made an important point about living life in that we should do it together, we don’t have to go it alone. While this doesn’t sound philosophically profound, it is a point that is often missed, especially in Christian circles. The Bible makes the point several times that we should live our lives together. Living for God is not an individual effort.