There's no arguing when the opposition is willing to handwave any verse away as a metaphor, an "illustration", or even "apocryphal" as some soul-sleepers have.
Although there is one thing you could point out: The Protestant's whole spiel was about how Jesus came to show us what resurrection/eternal life would look like, and that ours would look like His. Yet Jesus did not go to soul-sleep or any of that, He descended into Hades. So by the protestant's logic, if our resurrection is like Christ's, we would not go to soul-sleep or have our souls die, but we'd descend into Hell. Thus proving that the protestant's beliefs are actually contradicted by his own logic, therefore making his position that our resurrection/afterlife must resemble Christ's completely untenable.