Laura didn't tell them to completely give up on the tradition of using faithful slaves in the blood sea realm. She knew that Zhao Hai and the others needed faithful slaves because they could provide them with the power of faith. Bemoaning the state of the universe and pitying the fate of mankind was something that only the strong could do. To the weak, survival was the most important thing. What Zhao Hai and the others needed to do now was to survive.
However, Laura and the others had made some changes to the system. Unlike the others, they did not lock the believers underground and make them do nothing but pray and offer power of faith. In fact, Laura and the others had already discovered that the power of faith they could offer was not much. It was not strong or pure enough. Compared to Zhao Hai's power of faith, it was far inferior.
