If there is a "wall" in Heaven it is not to keep out dark-skinned refugees, but those who fail to test of mercy. See the parable of the rich man and Lazarus (Lk 16:19) and the chasm in the afterlife erected by the rich man's indifference to the poor while he lived.
Fox's Pastor Robert Jeffress says a border wall isn't un-Christian because "there's going to be a wall in Heaven"

Jul 26, 2019 · 5:15 PM UTC

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Replying to @RobertEllsberg
Modern Pharisees.
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Replying to @RobertEllsberg
I said yesterday to someone else, I feel like the wall is around hell, not heaven.
Replying to @RobertEllsberg
No walls in heaven. No locks on “private property” either. cf. Acts 4:32-35. @FrMalloy
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Replying to @RobertEllsberg
We surely know in what side he will be