Suppose Matthew added to Mark's crucifixion narrative the unhistorical story of the resurrection of Old Testament saints. How does that do anything to show Mark's account to be unreliable, not to speak of Luke or John's? It would at most call into question Matthew's credibility. Or would it? Suppose Matthew didn't mean for this to be taken literally? Suppose it's just part of the apocalyptic imagery typical of Jewish apocalyptic writings, a way of portraying how age-shifting Jesus' death was? Then our problem is that we're taking literary imagery in an inappropriate, literalistic way, and the problem is not with Matthew but with us.
Doesn't that conclusion call into question the rest of Matthew's resurrection account? Not at all! For Matthew attaches this story, not to the account of Jesus' resurrection, but of his crucifixion, which is one of the firmest anchor points of the historical Jesus.
But suppose Matthew did mean for this incident to be taken literally. How do we know it didn't happen? How do we know that certain people in Jerusalem hadn't claimed to have seen appearances of Old Testament saints around the time of Jesus' death? You say, it would have "unquestionably been documented by numerous sources." Really? What sources? Apart from Josephus, what records do we have from that time? And why think that Josephus would bother to mention it? He doesn't even mention Jesus' resurrection appearances, which, we know with certainty, people in Jerusalem had claimed to have experienced. We know from the Gospels themselves how selective they are in what stories they choose to narrate. So any such argument from silence is very tenuous.
Doesn't that conclusion call into question the rest of Matthew's resurrection account? Not at all! For Matthew attaches this story, not to the account of Jesus' resurrection, but of his crucifixion, which is one of the firmest anchor points of the historical Jesus.
But suppose Matthew did mean for this incident to be taken literally. How do we know it didn't happen? How do we know that certain people in Jerusalem hadn't claimed to have seen appearances of Old Testament saints around the time of Jesus' death? You say, it would have "unquestionably been documented by numerous sources." Really? What sources? Apart from Josephus, what records do we have from that time? And why think that Josephus would bother to mention it? He doesn't even mention Jesus' resurrection appearances, which, we know with certainty, people in Jerusalem had claimed to have experienced. We know from the Gospels themselves how selective they are in what stories they choose to narrate. So any such argument from silence is very tenuous.