This is SO fucking stupid it's got to be a deliberate setup designed to go to court.

> Attendance at the prayer meetings was mandatory for employees and was a condition of employment regardless of a worker's religious beliefs or affiliation, the complaint said.

As adamant as the owner appears to be, I'm pretty sure it must have come up in the interview process somewhere. And one of the reasons these people were hired was because they said they were okay with that policy.