It’s is morally right to be an ethno-Nationalist? What does the church say about such beliefs?

I’ve always considered myself one, but something in me is questioning it now. I’m wondering if it’s Christ reaching out to me. I could use some male  guidance in this area. If it is offensive to God, should I confess it? And should I make a public statement against it? I have spoken out about how we need to fight for European survival quite openly. That it is legitimate to want to preserve our culture above others. That by giving each culture their own country we can bring down crime rates, and stop Persecution of one race against another.

While I agree that an ethno-state has always been the norm, there is teaching against ethno-sameness within the Church.  

The account of Pentecost in Acts 2 emphasizes the ethnic diversity of the first Christians:
"[6] And when this was noised abroad, the multitude came together, and were confounded in mind, because that every man heard them speak in his own tongue. [7] And they were all amazed, and wondered, saying: Behold, are not all these, that speak, Galileans? [8] And how have we heard, every man our own tongue wherein we were born? [9] Parthians, and Medes, and Elamites, and inhabitants of Mesopotamia, Judea, and Cappadocia, Pontus and Asia,[10] Phrygia, and Pamphylia, Egypt, and the parts of Libya about Cyrene, and strangers of Rome,[11] Jєωs also, and proselytes, Cretes, and Arabians: we have heard them speak in our own tongues the wonderful works of God."

We see an account of ethnic tension in the early Church in Acts 6:
"And in those days, the number of the disciples increasing, there arose a murmuring of the Greeks against the Hebrews, for that their widows were neglected in the daily ministration."  This situation led to the appointment of deacons to oversee the fair treatment of all the ethnic groups.

This passage in Galations refers to ethnic (not religious) distinctions when it says "Jєω nor Greek":
"[26] For you are all the children of God by faith, in Christ Jesus. [27] For as many of you as have been baptized in Christ, have put on Christ. [28] There is neither Jєω nor Greek: there is neither bond nor free: there is neither male nor female. For you are all one in Christ Jesus."

The Church is meant to be one people called out from among all nations of the earth.  The Latin word "ecclesia" was borrowed from the Greek words meaning "called out". Ethnic distinctions are meaningless to our status as Christians.

I think that an ideal Christian state (not that any of us live in one of those) would care more about whether or not people were Christian than their ethnicity.

Ethno-nationalism is good and a natural inclination for preserving a collective, homogenous people as exhibited by St. Paul [Romans 9:3-5 (Douay-Rheims)]. It's warranted by God. The scriptures further prove it in 2 Esdra 4. Read it.

Precisely the opposite is true.

In fact, until at least the 1950s, the word "race" was used in a far, far broader sense than it is now. For an especially vivid example, look at the speeches that Charles Lindbergh made in 1940 and 1941, when his America First movement had the support of more than 70 percent of the American people in its quest to keep this country out of the Jєωιѕн-instigated World War II. Lindbergh spoke frequently of the vindictive goals of the Jєωιѕн race on the one hand and, on the other, of the legitimate and sensible desire for peace of the several western and northern European races that then constituted the overwhelming bulk of the US populace. The Jєωιѕн-led campaign to condemn him and the bulk of the American people of those days as "evil racists" did not gain any traction till the late eighties, by which time the Jєωιѕн brainwashing program had had almost five decades of success under its belt.

On a related subject, reparations, a topic near and dear to every Antifa activist's heart, see this linked article. Its author, here using a pseudonym, is a Traditional Catholic. He is also an ethnonationalist—that is, a patriot—and a man with no illusions as to the fate of white Christians once they have been completely disfranchised in the countries their ancestors built.

This passage in Galations refers to ethnic (not religious) distinctions when it says "Jєω nor Greek":
"[26] For you are all the children of God by faith, in Christ Jesus. [27] For as many of you as have been baptized in Christ, have put on Christ. [28] There is neither Jєω nor Greek: there is neither bond nor free: there is neither male nor female. For you are all one in Christ Jesus."