HolyBoy (HB) did it for you, because he is a mod, he can do such things.
From the Christian perspective, it's not really sad for the friends of Narnia to be removed from this world and taken into the next one -- it's only sad for Susan, because she is left behind.
It's the general thought that in LWW, Aslan represents Jesus, and Edmund represents us -- people who have done bad acts and need to be forgiven. The Christian perspective is that the death of Christ provided a way for us to be forgiven of prior bad acts (what we call sin) so that we can be reunited with God.
In LWW, Aslan's death -- because of the Deep Magic -- did this same thing for Edmund: provided a way for his bad acts to be forgiven so he could be restored to his family, and placed in a relationship/friendship with Aslan.
reading through all the books, you may have noticed Aslan sometimes says the children who are too old to come back to Narnia must learn to know him in their world -- it's the general thought Lewis meant they would come to know our Aslan, the earth's Aslan, Jesus Christ.