"If Q is what so many scholars assume it is – the earliest account of Jesus, then Q would had to have existed as a collection of documents for somewhere between 40 and 90 years without anyone making reference to it, then both Matthew and Luke would had to have independently gotten possession of copies of it, they would then had to have both integrated it into the Markan narrative in exactly the same way across dozens of scenes, and then they would both had to have lost all of the Q material such that it completely disappeared from the historical record. Note that there are not even any accounts from early Christian scholars of the second through fourth century that give any hint of the existence of Q. This would mean that, essentially, the most important document(s) of Christianity went unreferenced by all but two people, and both of those people lost their copies of the most important document(s) of Christianity."