It is not unbiblical or unchristian to enforce our national borders. Those who say globalism is what God wanted and that nations are merely a human invention need to the WHOLE Bible and not just the parts other liberal-influenced Christians tell them to read.
There actually WAS a time a long time ago when the whole world was one global people with one language and one common set of goals. We read about it in the story of the tower of Babel. What was God’s reaction to globalism? He didn’t like it. He divided the people by giving them different languages and thereby forced them to break up the global plan and form their own nations.
Later, God Himself starts a nation: Israel. He leads them out of Egypt so they can have their own land, and we read throughout the Torah and the books of Joshua and Judges about the laws and borders God gives His nation, and the borders are most definitely NOT open ones. We read about the many bloody fights Israel fought — at God’s command — to defend and enforce its borders against those who didn’t belong there or were not welcome. (I believe you’ll agree that we have a much nicer border enforcement system by comparison.)
Later on, after Israel is released from Babylon’s captivity, we read in the books of Ezra and Nehemiah how the first thing God has His nation do is build a wall to re-establish and enforce their borders.
There were also resident aliens in Israel, but they were there legally and followed the traditions and laws of Israel.
So yes, we should treat everyone humanely and with compassion — even people who break the law, but we have every right to turn away and expel people who don’t respect our borders and laws. Anyone who is TRULY serious and REALLY wants to be an American has the responsibility to prove it by becoming an American the RIGHT way. If it’s wrong to cut in line at the grocery store, how much more wrong is it to violate the rules and borders of our country? Jesus said to give to Caesar what is Caesar’s, and St. Paul exhorts obedience to lawful government, so no one should be trying to suggest a nation shouldn’t have and enforce laws. Doing things the right way isn’t always easy or convenient, but it’s worth it. Those who do things the wrong way will always have the consequences of their actions catch up with them eventually, so it’s better to have a little headache at first while doing it right than to have a much bigger headache later because you did it wrong. If you’ve done something wrong, you have the responsibility to admit your mistakes and try to make things right if you can, even if it’s hard. God rewards those who do what is right even when it’s difficult.