Many (but not all) private schools in the US are religious. From elementary school through college I attended Catholic affiliated schools. This sort of display would not be allowed at most public schools, and the ones that would allow it would be sued.
I remember, as a little girl, playing the part of the angel Gabriel… except I thought the character was named Gabrielle. The only reason I tried for the part was because I thought it was the only explicitly female role, besides Mary (and my unpopular ass wasn’t about to complete for the role of Prima Donna.)
It was a huge let down to find out that Gabriel was yet another male character in the perpetual sausage-fest that is The Holy Bible. Combined with how practically nothing was written about how Jesus would’ve been as a child, I never understood how I was supposed to relate to anything in that book.