Family Search has huge information available if you can get to a Church Family History Centre or an associated library. I have obtained many records for a small Evangelical Reformed Church community in the Italian part of Graubunden, pre1820. Much is scanned but not indexed so it takes some effort to search, but is worthwhile. If you search online at FamilySearch.org under Catalog and places Switzerland and then Canton Zurich and then your community of interest you will see what is available but possibly get to a lock symbol which indicates the need to visit the church for more. Good luck