And why are they obsessed with serpants??? Quoting: Anonymous Coward 5795678
Serpent represented Christ!
The serpent had been used as a life-creator symbol in Mesompotamia a thousand years before Abraham left his home at Ur. The serpent had been a life-creator symbol in Egypt for two thousand years before Moses lived there. The serpent was one of the earliest symbols of deity used by civilized man, and was part of the sacred symbolism of earliest Israel and the entire Near East. Thus, when Moses raised the brazen serpent on a pole for his people in the wilderness, the symbolism should have been clear. It represented their Creator-Jehovah. Even more significant, however, was the fact that it represented their Savior-Jesus Christ. John confirmed this symbolism:
And as Moses lifted up the serpent in the wilderness, even so must the Son of Man be lifted up, that whosoever believeth in him should not perish, but have everlasting life" (John 3:14-15).
It is an interesting fact that a brass or bronze serpent on a pole or beam was maintained as a representation of the Messiah of Israel in the chief temple of Israel from the time of Moses until near the time the temple of Solomon was destroyed in 586 B.C. Farbridge 75; Smith 240). [Note about destruction by Hezekiah for idol worship]
It is also very interesting to note the presence of the serpent motif in Mesoamerica in referring to the Creator-God. It is found in Mexico and Central America as early as 1200 B.C‑600 B.C. at La Venta. The serpent-life symbol runs rampant thorugh classic Maya art and architecture after AD. 300. The serpent symbolism continues right up to the coming of Cortes.
[Bruce W. Warren, The Messiah in Ancient America , chap. 6
[link to ancientamerica.org