The material here is probably representative of many Spiritualist churches, but naturally, other churches could differ. I would feel like a fool, or at best a rank amateur in such a place, because I am not a medium. Spiritualist church is similar. Natural law is your guide, and mediums bring evidence of the continuity of life on the other side through messages and phenomena. Although mediumship is a noble endeavor involving heavy responsibilities, spiritualists do not worship people who become mediums.
Spiritualist church is for everybody.
It's not a requirement. Most of the congregation aren't mediums, aren't going to be mediums, and aren't planning on it either. But they are Spiritualists just the same. Living your life in tune with nature's physical and spiritual laws is what makes a person a Spiritualist, not the ability to give messages from the podium. Besides, there is another, bigger podium than the one in the church, and that is found in everyday life.