@Krumple,
To be sure, there are many non canonical works. But one thing that has been learned from examination of the Dead Sea Scrolls, for example, is there is only minor variations between copies of the same texts.
Similarly minor variations are found between surviving manuscripts of the Christian texts. So, if you were to compare the King James version with a newer translation, made from a larger library of documents, you would still find only minor differences.
Additionally, one can examine texts in original languages for greater understanding. For example, take the Hebrew word nephesh, translated 'soul'. It is quite obvious from examining the texts that we do not possess souls we
are souls. And when we die, there is no longer any life.
The clergy do not benefit from this understanding, however. No indulgences, no expensive funeral services, etc.