I started this post because my friend and i made up a theory who and what is herobrine and mc BTW there is 2 entries who Herobrine is.
Notch is God. He is the creator of minecraft. Steve is Jesus. Steve gets killed an always respawns/revives, and he is in Lent. Herobrine is the devil. He attacks Steve when Herobrine failed to tempt him. Herobrine can't go to The Nether Realm (h€ll) or else he'll be trapped not being able escape. The End is a realm where time ends. Endermans teleport, so it is possibly to teleport to the end of time. The mineshafts, dungeons, etc are from the people before Steve/Jesus. Another Idea Who Herobrin Might Be: He is/was Adam. He is attacking Steve/Jesus because he can't take his rage out on Notch/God who took away Eve from him.