First of as new member you should make an introduction of yourself in the following thread, its one of the rules of the site so please follow that.
Well according to EA in the book KoF i believ there is a destinction amongst the 3 beings angels, demons and spirits. They have similuary functions but different approaches.
Most ppl on this site will argue that by own experiences they are not all the same inleds then the term djin is a broad description.
As for reincarnation being a lie Well thats only your opinion you cant disprove it but there are things that speaks for it.