Why are you idiots stuck on food? It's food, not forced conversion. They don't want pork products in their house, then there won't be any. What isn't right is taking the girls cross.
The real question here is why is there a foster family that isn't at least bilingual in a predominantly English country? Why are children who aren't Arabic speakers being placed in this home. Why are potentially intolerant religious care givers given a child not of their religion?
Also for all the edge Lords whose parents "made you" go to church, grow up. You are their kid, they want to go to church, guess where you are going. When you want to go watch the Sponge Bob movie, guess where your parents go even though they don't want to.