I believe it is all true. The reason that there are non-believers is that Lucid dreaming and astral projection has not been researched extensively and is not part of the "mainstream". People think that what is in front of them, is all that there is to reality.

I think that in a few years/decades, it will be a part of science class, and will be a part of everyone's lives. The word just has to get out, in a fairly big way.