So then the assumption would support the idea that if Satan came to Adam and Eve as a duck then we would fear ducks?
I would say that media has a MUCH stronger influence than religion on fears in general. I believe it a common misconception that it is religiously based, although I think it most likely impossible to prove conclusively. Are the most religious christians the most afraid of snakes then? I would think not. When movies or tv shows depict snakes, what are they using snakes for? Killing people and attacking cute animals perhaps? Why don't we see snakes playing with the animals in bambee? Same reason that Peter's enemy was a wolf. They hunt other animals and KILL!!! OH NO!!!! We fear their quick movement and know that some are venomous, but which ones?! Also, everyone knows some story of someone getting bit by a venomous snake, even if it is just from the news. That is scary stuff.
As far as international, I was in africa for some time, and have several close african friends, (like grew up in africa), and I have found them deathly afraid of snakes. I think that is what they were taught as children because there are lots of dangerous ones but (depending on the area), not as good education on safety etc. Also, antivenom is not exactly on the grocery list over there.
Ok, that is all. Just some thoughts.