White Nationalism and White Supremacy are an abomination to the Church

With the horror of at least 49 people killed by multiple gunmen at two mosques in Christchurch, New Zealand, we are confronted with the danger to civil society of Nationalism and Supremacy movements, both within a given society and in the geo-political sphere between nations.  And while both Nationalism and racial/ethnic/religious Supremacy movements have at times been ascendant around the globe throughout human history, with horrific results, it remains imperative that the Church purge itself of any such sympathies, rejecting them utterly.
Why is any form of Nationalism or Supremacy an anathema to the Church?  Simply put, they are 100% incompatible with the Gospel of Jesus Christ.  The only way for humanity to approach God is through humility.  If we cannot let go of the delusion that we can please God on our own, we will never accept that Jesus Christ died on our behalf, that he accomplished what we never could, and that our only hope is to accept his finished work on our behalf by faith through grace.  We can only approach God by abandoning any pretext that there is anything about ourselves worthy of God.  Not our ethnicity, not our nationality, not our gender, not our sexual orientation, not our skills or talents, not our job, not our riches, not our power or fame.  Nothing about us impresses God, for we are all alike lost sinners in need of God's grace.  There is no room for pride at the foot of the Cross.  There is no room for considering one type of person better, or worse, than another.  If we resist the call to bow our knee before God, we will remain apart from the saving grace offered by God.
How then can one person, or type of person, be better than others before God?  We may not look exactly alike, and we may see many things differently, but standing before God there is absolutely no difference; we are all equally hopeless in the face of God's perfect holiness.
What hope then do we have, if nothing of ourselves pleases God?  We can indeed be saved, not by anything that we are, or have done, but only when we have been clothed with Christ and transformed by the Holy Spirit.  This will not result in a spirit of superiority, but a servant's heart filled with gratitude and dedication to helping others find the grace we have received from God.
Murder is a direct insult to God who gives life, a horrendous crime whatever the motive.  To kill in the name of national or ethnic superiority is an even great abomination, for it also insults the willing sacrifice of Jesus and his call to share the Gospel with all nations.  Nationalism and/or Supremacy has no place in the Gospel of Jesus Christ, and it must have no place among those who follow him, for those who embrace and advocate such ideas are not misguided, they remain apart from God's saving grace and transforming power; they are evil.

Ephesians 2:8-9 (NIV)
8 For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— 9 not by works, so that no one can boast.

Galatians 3:26-28 (NIV)
26 So in Christ Jesus you are all children of God through faith, 27 for all of you who were baptized into Christ have clothed yourselves with Christ. 28 There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus.

Colossians 3:11-14 (NIV)
11 Here there is no Gentile or Jew, circumcised or uncircumcised, barbarian, Scythian, slave or free, but Christ is all, and is in all.

12 Therefore, as God’s chosen people, holy and dearly loved, clothe yourselves with compassion, kindness, humility, gentleness and patience. 13 Bear with each other and forgive one another if any of you has a grievance against someone. Forgive as the Lord forgave you. 14 And over all these virtues put on love, which binds them all together in perfect unity.