If God honored the relationship between the Edomites and Israelites as
brothers then
we Christians should take heed between ourselves.

Here is what God Says to Edom,
 
  Obadiah 1-21
 
    Oba 1:1   The vision of Obadiah. Thus saith the Lord GOD
concerning Edom; We have heard a rumour from the LORD,
and an ambassador is sent among the heathen, Arise ye, and
let us rise up against her in battle.
 
    Oba 1:2   Behold, I have made thee small among the heathen:
thou art greatly despised.
 
    Oba 1:3   The pride of thine heart hath deceived thee, thou
 that dwellest in the clefts of the rock, whose habitation [is] high;
 that saith in his heart, Who shall bring me down to the ground?
 
    Oba 1:4   Though thou exalt [thyself] as the eagle, and though
thou set thy nest among the stars, thence will I bring thee down,
saith the LORD.
 
    Oba 1:5   If thieves came to thee, if robbers by night,
 (how art thou cut off!) would they not have stolen till they
 had enough? if the grapegatherers came to thee, would they
not leave [some] grapes?
 
    Oba 1:6   How are [the things] of Esau searched out! [how] are
 his hidden things sought up!
 
    Oba 1:7   All the men of thy confederacy have brought thee
 [even] to the border: the men that were at peace with thee have
deceived thee, [and] prevailed against thee; [they that eat] thy
bread have laid a wound under thee: [there is] none
understanding in him.
 
    Oba 1:8   Shall I not in that day, saith the LORD, even
 destroy the wise [men] out of Edom, and understanding out of
the mount of Esau?
 
    Oba 1:9   And thy mighty [men], O Teman, shall be dismayed,
 to the end that every one of the mount of Esau may be cut off by
slaughter.
 
    Oba 1:10   For [thy] violence against thy brother Jacob shame
shall cover thee, and thou shalt be cut off for ever.
 
    Oba 1:11   In the day that thou stoodest on the other side, in
the day that the strangers carried away captive his forces, and
foreigners entered into his gates, and cast lots upon Jerusalem,
even thou [wast] as one of them.
 
    Oba 1:12   But thou shouldest not have looked on the day of
thy brother in the day that he became a stranger; neither
 shouldest thou have rejoiced over the children of Judah in the
day of their destruction; neither shouldest thou have spoken
 proudly in the day of distress.
 
    Oba 1:13   Thou shouldest not have entered into the gate of
my people in the day of their calamity; yea, thou shouldest not
 have looked on their affliction in the day of their calamity, nor
have laid [hands] on their substance in the day of their
calamity;
 
    Oba 1:14   Neither shouldest thou have stood in the crossway,
 to cut off those of his that did escape; neither shouldest thou
have delivered up those of his that did remain in the day of
distress.
 
    Oba 1:15   For the day of the LORD [is] near upon all the
 heathen: as thou hast done, it shall be done unto thee: thy
 reward shall return upon thine own head.
 
    Oba 1:16   For as ye have drunk upon my holy mountain, [so]
 shall all the heathen drink continually, yea, they shall drink,
 and they shall swallow down, and they shall be as though they
had not been.
 
    Oba 1:17   But upon mount Zion shall be deliverance, and
there shall be holiness; and the house of Jacob shall possess
their possessions.
 
    Oba 1:18   And the house of Jacob shall be a fire, and the
house of Joseph a flame, and the house of Esau for stubble, and
they shall kindle in them, and devour them; and there shall not
 be [any] remaining of the house of Esau; for the LORD hath
spoken [it].
 
    Oba 1:19   And [they of] the south shall possess the mount of
 Esau; and [they of] the plain the Philistines: and they shall
possess the fields of Ephraim, and the fields of Samaria: and
 Benjamin [shall possess] Gilead.
 
    Oba 1:20   And the captivity of this host of the children of
Israel [shall possess] that of the Canaanites, [even] unto
Zarephath; and the captivity of Jerusalem, which [is] in
 Sepharad, shall possess the cities of the south.
 
    Oba 1:21   And saviours shall come up on mount Zion to
 judge the mount of Esau; and the kingdom shall be the LORD'S.