Why A Barn?

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The Greek word translated manger can also indicate a stall (Luke 13:15)
which describes a cage where beasts not only have a place to lie down
(usually on straw) but also easy access to their fodder via a box built on to
one end, or side, of their accommodations.

The box is situated outside the cage and accessed by the animal via enough
space between the cage's slats for an animal's head to slip thru so the beast
can reach its food. I've seen arrangements like that at dairy farms and other
facilities too.

Now; seeing as how it was God who planned Mary's pregnancy, then He
could've easily timed it so baby Jesus would be born at home instead of out
of town. God also could've manipulated the availability of adequate housing
in Bethlehem but didn't.

It's as if God was determined that baby Jesus be born in rudimentary
conditions instead of something a bit more comfortable and a whole lots
more sanitary.
_

Yes, I believe that God is much more involved in the affairs here below than most men are comfortable with. They try to push Him out of their scientific ponderings and theories on a systematic basis. This fact alone would make modern man the greatest of fools, but men do not stop there. They willfully choose to do the bidding of their Father the Devil.

They consciously war against such Biblical facts as the simple creation story and the virgin birth. These things are not up for debate, my friends. We are far too tolerant with outright blasphemy coming from the lips of those who pretend to be of our number and tout themselves to be followers of Christ.

Psalms
75:6 For promotion [cometh] neither from the east, nor from the west, nor from the south.
75:7 But God [is] the judge: he putteth down one, and setteth up another.

Daniel
2:21 And he changeth the times and the seasons: he removeth kings, and setteth up kings: he giveth wisdom unto the wise, and knowledge to them that know understanding:
4:17 This matter [is] by the decree of the watchers, and the demand by the word of the holy ones: to the intent that the living may know that the most High ruleth in the kingdom of men, and giveth it to whomsoever he will, and setteth up over it the basest of men.