If you're referring to Acts 28 where Paul is bitten by a viper yet lives, I'd say ...
yes, it's reasonable to think it's a believable statement.
However, if you're referring to Genesis 3 and the fact that Paul likely believed in its contents in a more literalistic kind of way (i.e. with a talking serpent), and that this liklihood thereby begs the question as to just how much credance we can give Paul on much of anything he's written since we now entertain the hindsight of also having
Mr. Darwin now present in our scientific thought ...
... then I'd say that,
yes, it's also reasonable but in a much different kind of way. And needless to say, that way of which I speak won't be one that AV1611VET agrees with.