Rietheim birth, marriage, death records before 1742

Where would I find the records for my ancestors who lived in Rietheim prior to 1742? I am looking in particular for the Merz family. Thank you for your help.
 
There are 3 Rietheim in Baden-Württemberg:

Rietheim 1) Amt Villingen, Dorf (Village) 
Rietheim, Villingen, Baden
Rietheim 2) Oberamt Tuttlingen,
 Dorf (Village) 
Rietheim, Schwarzwaldkreis, Württemberg
Rietheim 3) Oberamt Urach,
 Dorf (Village) 
Rietheim, Schwarzwaldkreis, Württemberg

Which one is yours?
 
There are 3 Rietheim in Baden-Württemberg:

Rietheim 1) Amt Villingen, Dorf (Village) 
Rietheim, Villingen, Baden
Rietheim 2) Oberamt Tuttlingen,
 Dorf (Village) 
Rietheim, Schwarzwaldkreis, Württemberg
Rietheim 3) Oberamt Urach,
 Dorf (Village) 
Rietheim, Schwarzwaldkreis, Württemberg

Which one is yours?
2) Oberamt Tuttlingen. Sorry for the confusion
 
Till 1846 Rietheim belonged to Hausen ob Verena. The church records of Hausen ob Verena started 1742/1743.

Hausen ob Verena was destroyed in 1640. But I don't find any hint what happend to Hausen ob Verena between 1640 and 1742 that could be the reason why there are no church records before 1742.
 
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