Hello! You’re absolutely right about the confusion—this is common in many non-English-speaking countries, where "faculty" can mean a department or section within a university. In English-speaking countries, however, faculty typically refers to the academic staff as a whole (professors, lecturers, and researchers).
To describe a specific section within a university (e.g., the part dedicated to a certain field, like Engineering or Humanities), native English speakers usually say "department" or "school" (as in "Department of Biology" or "School of Law").
In short, it’s better to avoid using "faculty" to describe a section or division within the university when speaking English, as it could lead to misunderstanding. Instead, sticking with "department" or "school" will make it clearer.
Hope this helps, and good luck with your studies!