The Dreamers are not "visitors".
If one thinks that there can be an actual complete separation of church and state, they don't understand religion-- Gandhi (paraphrased).
But really the issue here is compassion for those in need, which I would hope one should feel is important if they're actually a believer in Jesus. Jesus clearly was compassionate and just (fair). Maybe it's best for you to reread the Sermon On the Mount and the Parable of the Sheep & Goats (Matthew 25). Maybe it's best for you to reread the Psalmist where he says nations will be judged by how they treat the poor.
"Jews" is a nationality-- not a religion nor a form of government. There a Christian Jews, secular Jews, etc. "Judaism", a religion, does not dictate what form of government a state must have, and I would suggest the Israel is a "Jewish country" that actually is a thriving democracy-- not a theocracy.
"Muslims" are members of a religion (Islam), but it does not dictate which form of government there must be. The most populist Islamic country is Indonesia, and it is a democracy:
Indonesia - Wikipedia
You actually might consider looking things up before posting, Phantasman.