Final answer:
Qualitative research is used to identify the knowledge, beliefs, and behaviors that are common in the existing system. It involves gathering non-numerical data to gain an in-depth understanding of a phenomenon.
Step-by-step explanation:
The method that is used to identify the knowledge, beliefs, and behaviors that are common in the existing system (sacred cows) is qualitative research. Qualitative research involves gathering non-numerical data such as interviews, observations, and document analysis to gain an in-depth understanding of a phenomenon. It is particularly useful in studying the symbolic worlds and subjective experiences of research subjects, making it a suitable approach for studying religious beliefs and rituals.