Opava Archive Digital Records available on FamilySearch with search engine.
"Images and some indexes of baptism/births, marriages, and deaths that occurred in the Roman Catholic, Evangelical Lutheran, and Reformed Church parishes, as well as entries in those registers for Jews. These images are of original parish records created by local priests of each parish now stored in the regional archives of Litoměřice, Opava, Třeboň, and Zámrsk. Births are available through 1912, marriages and deaths through 1937."
If you don't find them on the search engine you can use the "Browse all 4,6687,489 images". Choose religion, choose district, choose parish.
If you don't know the district you can sign-up for free on genteam.at. You can also find the district on Wikipedia.
https://www.familysearch.org/en/search/collection/1804263