Well it spreads to those around them. It becomes part of the culture even if it means nothing to others.

Weirdly, the boss was very Christian. I guess he valued money over his beliefs, and the superstitions of others?

13 being unlucky is mostly believed by Christians.

More like westerns, the superstition started out in Mesopotamia.

I wonder if non-Christian people do not mind living in 13th floors.

Yes, but then they avoid “their” unlucky numbers. Like 4 in Japan.

In Vancouver the buildings don’t have 4th, 13th, 14th, or 24th floors. So it goes from 12th floor to 15th floor.