And that is the problem here. The poster of the op is completely inept at understanding proper interpretation of scripture. It has led to some very aberrant understandings.
Snakes are snakes and are not to be allegorized away.
Look at it this way. Jesus was speaking to his disciples. This is what he said:
Mark 16:14 Afterward
he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen.
--Context: he is speaking to the eleven. What was the occasion?
Their unbelief! He rebukes them. "Because they believed not them which had seen him after he had risen."
After the Great Commission is given he tells them:
Mark 16:17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
Mark 16:18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
--At first they did not believe. They were rebuked. Now they believe.
This is directed to the eleven.
Now what are these eleven thinking? Are they thinking of the Book of Revelation which hasn't been written yet? Are thy thinking of serpents in Moses time? Are they thinking in allegorical terminology?
NO! Not at all. They are thinking literally.
They had cast out devils previously; they would do it again.
The time would come when they would speak in other languages; they knew of the prophecy.
They had already healed sick; they would do it again.
God had already given them protection; he would give it to them again, even if it meant protection from deadly serpents and poisonous substances, which the pagans would certainly try to give them and kill them therewith.
Now if you are going to claim this for yourself go ahead and give us a demonstration. There was a deadly snake that crawled up Paul's arm. He shook it off into the fire with no harm, but the pagans, who thought he would die, then considered him a god, when he didn't. If you would like to give us a like demonstration, be our guest.