I was doing some research in the Bible because this question has made me wonder and found some answers in 2 Kings 17.
It explains how the people of Israel were carried away and destroyed for worshiping idols and following the laws of other people. Then Assyria people came to live in the land, but were being destroyed by lions until a priest taught them how to worship God.
2 kings 17
[SUP]28 [/SUP]Then one of the priests whom they had carried away from Samaria came and dwelt in Bethel, and taught them how they should fear the Lord.
However the nations still worshiped their own gods but were afraid of the Lord so tried and worship Him too.
" [SUP]33 [/SUP]They feared the Lord, yet served their own gods—according to the rituals of the nations from among whom they were carried away."
They did not understand the commandment to worship ONLY God and not to fear the other gods. That the only one they should worry about being afraid of is God.
Their gods demanded that they make child sacrifices, worship demons and perform other acts that God forbids His people from doing because its a perversion of His plan and His love.
So I think that Samaritans are looked down as half-breeds because they did not have any blood ties to Abraham and many people did not understand the spiritual descent that Jesus spoke about in these verses:
John 8
[SUP]39 [/SUP]They answered and said to Him, “Abraham is our father.”
Jesus said to them, “If you were Abraham’s children, you would do the works of Abraham. [SUP]40 [/SUP]But now you seek to kill Me, a Man who has told you the truth which I heard from God. Abraham did not do this. [SUP]41 [/SUP]You do the deeds of your father.”
Then they said to Him, “We were not born of fornication; we have one Father—God.”
[SUP]42 [/SUP]Jesus said to them, “If God were your Father, you would love Me, for I proceeded forth and came from God; nor have I come of Myself, but He sent Me. [SUP]43 [/SUP]Why do you not understand My speech? Because you are not able to listen to My word. [SUP]44 [/SUP]You are of your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it. [SUP]45 [/SUP]But because I tell the truth, you do not believe Me. [SUP]46 [/SUP]Which of you convicts Me of sin? And if I tell the truth, why do you not believe Me? [SUP]47 [/SUP]He who is of God hears God’s words; therefore you do not hear, because you are not of God.”