I have two Schindelars (Michael and Viktor) living in Hadikfalva, Bukovina in 1910. They were both Greek Orthodox, but married to Roman Catholic wives. Michael was born in 1871, and Viktor in 1879. Michael's 5 children (1902-1910) were baptized Greek Orthodox in Radautz, and Viktor's three children were baptized in Radautz (also Greek Orthodox).
Parents of Michael and Viktor were Pantaleonis Schindelar and Anna Zusz.
Not sure if there is any direct relationship to your Schindelars, but it's not a really common name.