The Doctine of Origins origionally started by Emporer Caius of Ta'Kara, and was a forced religion through out the Empire of Ta'Kar. It is believed that the House of Ta'Kar started the Doctrine as a means to impose loyalty to the citizens of the Empire. Once Caius gained control of the Empire he imposed the Doctrine of Origins, which included the destruction of all heretic historical documents. He destroyed any documentation that stated humanity came from Earth or the Sol system and that they were created and born of Ta'Kar. This helped him in the sense that he was trying to become a God.
For over 100 years, the Doctrine of Origins have progressed to a state of religion. The exact text of the Doctrine still isn't known, some can speculate on what it says, but until the text comes into the hand of the United Earth Republic intelligence will be limited.