Was your family Catholic or Lutheran (Protestant)?.
When Lutheran worship was forbidden for many years families had to flee. Many fled to the mountains of Stryia where they could worship in secret. Ramsau am Dachstein was one such village.
The Lutheran church books are archived by the Catholic church at Bichoefliches Ordinariat Graz-Seckau - Dioezesanarchiv, Bischoplatz 4, Postfach 872, A-8011 Graz.
If you write to them it is best to send a formal German letter.