Daniel Cabuco has graciously provided the long awaited answers for the cut parts of Legacy of Kain and much more! In a question about intended appearance of Umah and Vorador, Daniel replied that she was supposed to make an appearance as a vampire worshipper after Vorador was beheaded (supposedly when Raziel would have returned from Avernus), but was ultimately replaced by a cutscene with Moebius.
According to Daniel, Raziel would be given a quest by Umah to reclaim Vorador´s head from Moebius´ statue holding his head. This would reward Umah with being turned into a vampire. Daniel also stated that the cut was necessary due to time and also that two resurrections taking place (Raziel had to resurrect Janos as well) was a bit redundant.