Actually, Marty is right, "Christian textual critics, who have little in common with Christians except they like to denigrate the Faith with clever textual punditry." is not a Ad Hominem. Rather, it is an example of the Appeal to Spite -- dismissing an argument because one does not like the person(s) presenting it.

Marty is wrong when he claims that the early Christians believed that the Second Coming was immanent. Along with the quotes given earlier,  1 John 2:18 comes to mind: "Children, it is the last hour! As you have heard that antichrist is coming, so now many antichrists have come. From this we know that it is the last hour."