While I am not a bible scholar, I don't see where the "simulation" talk is anti-Christian. Jesus says many times that this existence is not the end. Even the Creation story says that God created (everything) but doesn't say anything about planes of existence - in fact, there is enough in there to suggest that heaven and earth, which were created simultaneously, may be different planes of the same reality. Does the Bible say that God is an old man seated in a cloud? Of course not. Even the notion of "rising" into heaven - does that mean physically "up"? Which way is "up" in space? It could easily mean that by rising one is ascending to new planes of reality. We have no way of knowing. All we know is that someday we will join God in heaven - even if we don't know what heaven is.

Jesus says that there are but two commandments - believe that He is indeed the Son of God, and to serve one another as we serve God. Aside from things that directly oppose those ideas, I see no heresy here.