Church Staffs and employees are not the same for every church. Here is a list of possible titles / Staffs:
In Catholic churches and some other liturgical churches, the church area is called a parish and the person attending that church is a "parishoner". Some non-liturgical Protestant churches use this term as well, but most would use either the terms "congregant" or "member".
I think you are referring to a sacristan or sexton
A verger takes care of a church
Tech Person
a slave
Employee
someone who works for a business
An employee.
keelman
moofer
A mathematician
A vulcanologist.
hydrologist
A Chronogist
Railroader