Politics has been around since forever. The powers that be at the time met and decided what books were God's word and what books were fake/forgeries. Did God tell them or did they just decide on their own which books they liked and which they didn't? There were various councils over many years that addressed the issue. And politicians who controlled what was in and what was out. Do you trust those politicians of ancient times any more than you trust the politicians of today? Why? Human behavior has not changed.