Where does the Gospel of Mark claim to be written by the Apostle Mark? Or Matthew for that matter...
That is one of the reason why they are deduced to be forgeries. The Christian Community knew they were Anonymous but attributed the Gospels to FAKE 1st century unknown characters.
Apologetics for hundreds of years like Irenaeus, Tertullian, Origen, Eusebius, Jerome claimed the Gospels were written by Matthew, Mark, Luke and John.
Brainache said:Just because later tradition assigned names to the Authors, doesn't make the writings "forgeries".
You seem to have no idea that Scholars like Bart Ehrman have admitted that the Gospels were either forged or mis-attributed to Matthew, Mark, Luke and John.