There are a ton of different connections you can find between Ender's Game and Christianity, however, I do think that Sacrificial Love, Ender as Christ, Good vs Evil and Deception were the most prominent themes in the movie that tie into Christianity. Although Gavin Hood and Orsen Scott Card may not have done it intentionally, various parts in the movie connect to Jesus' life. For example, when Mazer Rackham sacrifices his life to save mankind where Jesus died on the cross to save us, or how Colonel Graff deceives Ender just like Satan deceived God becoming a "fallen angel". So you can see the obvious connections in Ender's Game to religion. I encourage you to watch Ender's Game, or any movie for that matter and see if you can uncover any connections to religion You may not be able to see it if you are not looking but the parallels in this movie and in religion changed my perception on how I see movies and all the hidden connections they may hold.