Who objected to the children's presence in the First Purchase?

The only person to object to Jem and Scouts presence in church was a woman named Lulu.

Lula stopped, but she said, “You ain’t got no business bringin‘ white chillun here —they got their church, we got our’n. It is our church, ain’t it, Miss Cal?”

Calpurnia said, “It’s the same God, ain’t it?”

Jem said, “Let’s go home, Cal, they don’t want us here—”

I agreed: they did not want us here. I sensed, rather than saw, that we were being advanced upon. They seemed to be drawing closer to us, but when I looked up at Calpurnia there was amusement in her eyes. When I looked down the pathway again, Lula was gone. In her place was a solid mass of colored people.