If the church was Roman Catholic, then their records would have been transferred elsewhere. Have you contacted the Catholic diocese for that area to see who might have the records.
Any civil marriage license records for them?
What info is on the birth certificates of the children?
If the children were married in Catholic wedding ceremonies, then they would have needed proof of baptism. What did they use as proof if the church was no longer in existence.
There are still other routes to follow to get the info you need. You just need to be inventive.