I have been reading Oahspe for the past week, it really does have an amazing vibration and dreamlike quality. I'm only up to the section on Zarathustra but I haven't found much information focusing on reincarnation saying blatently that it is a "false" doctrine. So far I've found mention of spirits not making the grade being carried off to another world to continue their corporeal lessons, and also of a place where dark spirits had been taken in order to have another chance as mortals. To me this could be evidence of group reincarnation. Oahspe also continually details the inner planes infastructure's development of hospitals, schools, factories, housing, etc. setup by the ethereans in order to conduct healing on spirits that need it, and mentions that gradually these places empty out. This could be evidence of reincarnation. I think the book might keep a veil on the intracacies of reincarnation due to biases set up in some religious groups to be for/against this idea. I have just started reading and have yet to finish, but I don't agree that Oahspe denies reincarnation completely from what I've read. I will edit this post once I finish reading..
edit: There are more references to reincarnation towards the middle of Oahspe. It seems to use the term "teachers of reincarnation" negatively sometimes which refers to a mortal group, like the religions of India teaching reincarnation without giving the core teaching of the One God, the great Spirit and Creator. Zarathustra seemed to change everything to the One God religions while living in Persia and that was like 1000 BC..
edit: There are more references to reincarnation towards the middle of Oahspe. It seems to use the term "teachers of reincarnation" negatively sometimes which refers to a mortal group, like the religions of India teaching reincarnation without giving the core teaching of the One God, the great Spirit and Creator. Zarathustra seemed to change everything to the One God religions while living in Persia and that was like 1000 BC..