It is more important that we be there for others than it is to know exactly HOW to be there for them. When Christy reaches his heaven, he is in awe. Christy replies that his brain is who he is. Albert explains that the brain is merely a body part that will decay and disappear. If your house were to crumble, you could walk out.
Thought is real, but physical is illusion.
Christy's heaven and the daughter's heaven are very different. They each have created their own heaven from what they dreamed it would be. In this movie one may chose to be reincarnated. When Annie commits suicide, she is in hell. Christy finds it unjust that she has been sent to hell.