The diversity criteria at business schools definitely cover religion but the question is how do you portray it. Playing the minority card is trickier than applicants think.
Firstly, do not mention any diversity of the context that doesn’t allow for it. If you’re narrating a story about having flip flops to a business conference, I doubt religion could be relevant. In such a case, if you talk about your religion being a minority, that won’t sit well with the adcoms. It would only seem like you feel victimized due to your minority status.
What you want to portray to your business school is how your religion, although a minority, have helped you throughout your life. That even though it might have put you in a tight spot at times, you also learned to come up with efficient and out-of-the-box solutions due to the same.
Use your diversity as an empowering thing rather than victimizing element.