Why Does Shaw and Holloway believe the Jockeys created Humanity?

Beyond discovering cave paintings/artifacts from around the world depicting giant beings pointing to a particular constellation, what other evidence did they come across to make them believe the Engineers created/seeded Humanity? Did they see the prologue like we the audience?? ( As an additional note, The hologram depicting the Lid of Palenque is wrongly labelled as being from Teotihuacan, Mexico, when it is clearly not. )