As first pointed out by Bustle, the number "828" can be read as 8:28, which could indicate Romans 8:28, a bible verse of particular relevance to the plot of the show. There are dozens of different English translations from scores of different versions of the Bible, but one translation in particular seems to be the most widely agreed upon: "And we know that in all things God works for the good of those who love him, who have been called according to his purpose."
Once you know the wording of the verse, the symbolism becomes about as subtle as a sledgehammer. The passengers of flight 828 are being "called" according to God's purpose, which is to selflessly help others — a very important tenant of true Christianity. And the writers want you to connect these dots, too. If not, they wouldn't have gone to all the trouble of showing Michaela's (Melissa Roxburgh) mother's custom-made pillow with the verse embroidered on it.
Given all of this knowledge, it's hard to argue that it's just a coincidence that the numbers "828" are so heavily incorporated into the show. But is that the only bit of symbolism connecting the show to the Christian religion?
