How do Catholics and other Christians respond to the US Bishops' teaching that Matthew was not written by it supposed author?

In its [Introduction to the Gospel of Matthew](https://bible.usccb.org/bible/matthew/0) , the website of the US Council of Catholic Bishops (USCCB) states: > *The ancient tradition that the author was the disciple and apostle of > Jesus named Matthew (see Mt 10:3) is untenable because the gospel is > based, in large part, on the Gospel according to Mark* (almost all the > verses of that gospel have been utilized in this), and it is hardly > likely that a companion of Jesus would have followed so extensively an > account that came from one who admittedly never had such an > association rather than rely on his own memories. The attribution of > the gospel to the disciple Matthew may have been due to his having > been responsible for some of the traditions found in it, but that is > far from certain. In so saying, the USCCB website also accepts the theory of Markan priority and the existence of the hypothetic Q source, consisting of material not found in Mark but shared by both Matthew and Luke. In other words, they hold that Mark is the oldest Gospel and the other two synoptic writers expanded it by using the Q material together with their own unique sources and perspectives. > The unknown author, whom we shall continue to call Matthew for the > sake of convenience, drew not only upon the Gospel according to Mark > but upon a large body of material (principally, sayings of Jesus) not > found in Mark that corresponds, sometimes exactly, to material found > also in the Gospel according to Luke. This material, called “Q”... represents traditions, written and oral, used by both > Matthew and Luke. Mark and Q are sources common to the two other > synoptic gospels; hence the name the “Two-Source Theory” given to this > explanation of the relation among the synoptics. The website does not state whether this introduction is to be considered authoritative. **How do rank-and-file Catholics, scholars and other Christians respond to this apparent teaching of the USCCB?**