The Christian argument for the bodily resurrection of Jesus would be a little stronger if the majority of NT scholars believed that the Gospels were written by eyewitnesses, but they do not. Only a small minority of mostly evangelical Christian NT scholars (with an agenda—biblical inerrancy—) hold this view.
But even if the Gospels were written by eyewitnesses, or even if we could be certain that the four resurrection stories in the Gospels were originally told by eyewitnesses, who today would believe the eyewitness testimony of a bunch of uneducated, rural peasants claiming that they had just eaten a broiled-fish lunch with their recently executed former fishing buddy???
It is a silly story, folks. Modern, educated people should not fall for it.
Eyewitness testimony may be sufficient evidence for car accidents and murder trials, but it is not sufficient evidence to believe claims of sea monsters in Scottish lochs, alien abductions, or zombie sightings. If twelve guys told you that they had all eaten lunch with Big Foot on a recent hunting trip would you believe them? No. So why believe a second hand report that eleven fishermen (and one tax collector), two thousand years ago, ate a broiled fish lunch with a walking/talking dead guy (zombie)?