The weight of the apostles' claim is that it was empirically falsifiable at the time. All the enemies of Jesus had to do was produce His body, and Christianity is stopped dead in its tracks (no pun intended) (okay, maybe itthe pun was intended). Little wonder that they placed a guard at the tomb; little wonder that they invented a naturalistic explanation for the disappearance of Jesus' body--and yet in doing so, they provided corroborative hostile testimony (see Matt. 28:11-15). They wouldn't have had to invent a story to explain the absence of Jesus' body if it were available for examination.
- The claim that they didn't have x-rays & DNA is not falsifiable. Oops =)
- People did in fact have DNA at the time (if they didn't, Dillahunty's own worldview has some serious problems)[editorial insertion: for those perplexed by this bullet point, yes, this bullet point was intended as humor]
- The Romans did have at least 2 foolproof means of testing whether someone was dead: a) beheading & b) crucifixion. A person being crucified must push up with their legs in order to breathe (the "up position"), they can then release the pressure on their legs until they need to breathe again (the "down position"). If they are in the down position for 10-15 minutes, they're dead (see article by Habermas here).