Native Americans adopted ONLY by other Native Americans!
Blacks adopted ONLY by other Blacks!
Whites adopted ONLY by other Whites!
Orientals adopted ONLY by other Orientals!
Latinos adopted ONLY by other Latinos!
Left-handed Americans adopted ONLY by other Left-handed Americans!
/s
Children of Catholic mothers only to Catholic families...
Children of Satanists only to Satanists...
Another problem is that adoption agencies run by churches tend to place kids with believers.
I would have to wonder if this was to stop discrimination against gay parents.