Epistemology wise, I'm an agnostic. Belief wise, I see no problem with a finite human mind seeking connection to a universal mind. We humans seem, in our basic nature, meant to seek meaning, love and greater understanding. I think the couple in question are blocking their own path in this seeking, but have not followed the case closely enough to know where they land on the spectrum of prejudice.
Be interesting to hear a theologian like Robert Barron weigh in on this.