They include an airline worker stopped from wearing a cross and a registrar who did not want to marry gay couples.
All four lost separate employment tribunals relating to their beliefs.
Secular critics have said any ruling in favour of the group could "seriously undermine" UK equality law.
Toward What is God Moving the World?
I'm surprised that the stewardess wearing the cross was part of the Pentecostalism movement. The German Court won't be so compelled to rule in her favor is she were a Catholic.