I'm not a lawyer so this could be completely wrong, but, I'm cautiously optimistic that the "belief" part has come first - and has had such an extensive hearing.
These few days are (I think) called a positions hearing - this isn't the actual employment tribunal, which will happen at some future date. At present it is about establishing what the framework for the tribunal hearing will be, and there are two things to establish - firstly whether Maya counted as employed by the organisation and secondly whether her views and her expression of those views constitute a "Grainger test" belief.
You would have thought that the judge would have chosen to do the employment status first, surely? Much less contentious. And, if it turned out she was not "employed" in the legal sense, then none of the belief stuff would have been heard at all, because there would not be going to be any employment tribunal after all.