I´m not sure if what they are doing is illegal but yes, it sure is censoring. I seriously can´t see what legal ground they would have against google.
They claim that the pages in question are showing material that is under scientology copyright if I understand this correctly. I couldn´t find any of their bible material on the pages that has been removed except for in the leaflet part of the site. At the bottom is a picture of a hand written part of the bible. There are also references to Dianetics and Scientology (duh) in the documents, these are trademarks of the church. How the law is applied to those I don´t know.