It is not uncommon for students, especially non-biology majors, to disagree with the practice of dissection.
The faculty of the Biology and Molecular Biology department feel that in many cases the best way to learn about organisms is to study them directly. For anatomy and physiology, this often requires the euthanizing of specimens to prevent pain and suffering.
It is possible that your instructor will provide alternative means of learning for you. The first step is to speak with the instructor during the first week of class to see if this is possible. If the instructor cannot accommodate you, contact the department chair to explore the possibility of switching sections.