Jesus was prone to hyperbole so I believe he was being metaphoric in this case. What cannot be dismissed is his statement at the end of the book of Mark:
15 He said to them, “Go into all the world and preach the gospel to all creation. 16 Whoever believes and is baptized will be saved, but whoever does not believe will be condemned. 17 And these signs will accompany those who believe: In my name they will drive out demons; they will speak in new tongues; 18 they will pick up snakes with their hands; and when they drink deadly poison, it will not hurt them at all; they will place their hands on sick people, and they will get well.” Mark 16:15-20 New International Version
The highlighted scriptures are those that would be more difficult to fake (unless they choose their snakes and their 'poison'. And yes I know that this scripture does not appear in some manuscripts but that only highlights the contradictions of the Bible.