Why assume that Hugh Glass is a secular liberal? Your demand already begs the question (assuming that illegal immigrants are thieves), but one could point to any number of passages in the Gospel that advocate for a far more charitable view of others - including foreigners - than you apparently hold - for example, the parable of the Good Samaritan (Luke 10:30-37). Or how about the Beatitudes?

5:39-40: But I say unto you, That you resist not evil: but whosoever shall smite you on your right cheek, turn to him the other also.
And if any man will sue you at the law, and take away your coat, let him have your cloak also.
5: 44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them who despitefully use you, and persecute you;

7:1-2: Judge not, that you be not judged.
For with what judgment you judge, you shall be judged: and with what measure you measure, it shall be measured to you again.