dear mP...
the serpent is not representitive of messengers of God as you have stated but have been representitive of wisdom. For instance...the depiction of the serpent in the garden of Eden as "more cunning than any beast of the field" is drawn from what was commonly accepted in Egypt...the serpent was symbolic of wisdom.(that is why the serpent referenced "knowledge" to be like God) The pharoah had a headpiece that placed a serpent right in the middle of his forehead to symbolize his wisdom in ruling over the people.
in the book of revelation there is depicted a great war between the "forces" of God and the "forces" of satan...it reaches its finale when the wisdom of satan and "his" angels are cast down and there is no place found in heaven for "him"(rev 12:8-9)...the serpents offer of "wisdom" of good and evil is shown to be ultimately inferior to the life giving wisdom of the knowledge of God.
we are told to be as wise as serpents but as innocent as doves (matt 10:16)...in revelation it is the wisdom of God that leads to knowledge of who is behind the scenes in deceiving the world with his "wisdom" (rev 13:16,18) ...(the wisdom of God in the knowledge of Jesus Christ as the ONLY way of salvation has little VALUE in todays economy, so to speak). in matthew 11:18-19 Jesus is comparing those who rejected JtB and his message about the Messiah(john 1:6-13) to those who rejected the wisdom from God...the children who didn't reject the wisdom of God in Jesus Christ are NOT those portrayed in verse 17 still waiting for the Messiah to appear from among them. proverbs 9:1-6, 10.
there is a contrast between the wisdom of God and the wisdom afforded satan throughout the bible. The wisdom of God gives life, the wisdom of the serpent brings death. It is shown in the bible that this is the way it has always been since the beginning. God works in mysterious and wise ways to draw men to Himself: John 3:14-15...
love michelle