Hey they started that process of censorship big time during the Council of Nicea. People don't realize that their Bible is one of the earlier historical records of censorship and alteration by a council of people. This is the true reason the Dead Sea Scrolls were a big deal. They were a collection of documents that survived the purge POST Council of Nicea. Many "Christians" don't know about their ancestors destruction and damage in terms of the Library of Alexandria. That was one of the most damaging losses to knowledge from our past in history. So yes, they were capable.
I was not discounting your theory. It may be possible. I'm one of those that keeps an open mind. I might believe some things without believing the full tale. So I will have to look into this a bit more. I do know the Catholic Church destroyed and covered up a lot of information.
Man... if we had a time machine and could save the documents from Alexandria... what a wealth of information that'd likely be. I know we only have limited works by Plato due to that fire and he was known to have written far more. The works we have are of immense value, so that loss was horrible.