A Christian belongs in the camp of liberalism like Lot belonged in Sodom -- that is, not at all. However, because we're reactionary beings, we can react against liberalism and fall backward into the errors of secular, worldly conservatism. Also, because Christians often find common-ground with secular conservatives on social issues, we can be dull to the ethical and attitudinal dangers in secular conservatism.
1. Experience, natural human reasoning, and tradition should never override the Scripture.
The Scriptures are God's authority on everything they say, including politics, economics, and the military. Secular conservatism builds its cases on traditions or practical experience, or both. There's nothing wrong with learning from tradition. Sometimes the people of the past had very good reasons for doing what they did. It's arrogant to think we have nothing to learn from the past. The same goes for practicality. Science is better than magical thinking. In many situations we should do what works.
However, these are not the Christian's highest authority for faith and action. God's Word, the Bible, overrules experience and tradition, at all points. What's "practical" might not be moral. What's traditional could be evil, or just plain foolish in the light of Scripture. Man-stealing and human trafficking was the American tradition for centuries, and it was both evil and foolish. We should take every thought captive to the obedience of Jesus Christ (2 Cor. 10:5), including our political and economic thoughts. Secular conservatism does not respect the Bible.
2. Money and Military are not more important than Faith and Morality.
Isaiah wrote," Woe to those who go down to Egypt for help And rely on horses, And trust in chariots because they are many And in horsemen because they are very strong, But they do not look to the Holy One of Israel, nor seek the Lord!" Isaiah 31:1.
Secular conservatives don't have their priorities in the right order. A nation's greatness lies in its faith in the true God, not in its treasury or its armed forces. Wise economic and military policies are needed, but wisdom comes to those who fear the Lord. Proverbs 9:10. Secular conservatism is preoccupied with worldly concerns. It's proper to pay attention to the condition of your herds and flocks (Proverbs 27:23-24), but blessing comes from the Lord to those who fear Him. Many is the rich nation that has gone down in flames because God unleashed His wrath against it.
3. Christian patriotism is good but secular nationalism is not.
Christians should thank God for every good gift, including the gifts He gives them through their nation. Every Christian from every nation can do this. The old patriotic song, "America! America!" credits God for our amber waves of grain and purple mountains' majesty, and it's right that we do so. This is a positive and healthy patriotism.
Extreme liberalism sees the United States as the focus and origin of evil in the world, and this reflects a warped, one-sided mentality. But the U.S. is also a fallen and sinful nation, laden down with sin. We are by no means a Christian nation (the Christian Church around the world is God's nation, 1 Peter 2:9). When Christ said, "Do not have any god before the Lord", that means we don't worship our nation.
To paraphrase the old Gospel song, "This country's not my home, I'm just a 'passin' through." God put us Christians here to bless and salt the U.S., just as He told the Jews to bless Babylon while they lived there. But worldly national pride is just as bad as worldly globalism.