So, anyone is saved should have the following properties:
- Will drive out demons
Above average language learning ability
Will pick up snakes
Immune to poison
Will heal sickness by placing of hands
Now, perhaps in many cases we have no information - it may be the case that, despite having the ability, the believer simply hasn't tried to drink poison, and so remains unaware of their immunity. But the text says that believers will (not just can) drive out demons and heal the sick.
It may also be that this passage refers to believers as a group, and the signs will follow the group rather than the individual. So groups of believers should have at least some people who can heal by laying on hands.
Why is all of this not actually happening in the world today? Are there no actual believers left?
Or, if you think this is happening in the world today, why is it not making the newspapers or being talked about anywhere?
[Required disclosure of my own views: I am an atheist and do not personally believe that "salvation" is an actual thing that exists.]