text: That's not Catholic teaching. Patriotism is a great Christian virtue. Patriotism is a descendant virtue of the cardinal virtue of Justice.    We owe our father-land love;  it owes us protection. 
  
  It flows from the 4th Commandment, the first so-called horizontal commandment. 
  
  More Catholics should push away trendy and light ideas and go deeper.
  
  Read this beautiful treatment: http://catholicism.org/ad-rem-no-232.html
  
  From Br. Andre Marie at thai site:  "Patriotism is a great virtue. To be a patriot is to love one’s fatherland. This means that it is to love the land of the people that sired you. Patriotism is a natural overflow of the virtue of piety — that is, the virtue of the home. As piety would have us rendering what is due in justice to parents and other family members, patriotism would have us render the same to our nation, its government, and our fellow citizens. Both of these are a matter of justice, for the virtues of piety and patriotism are parts of that cardinal virtue."