Tena,
I don'tknow how much help this will be but I have some Schnepf information in my data base as follows:

Wendel Schnepf b.ca 1563 in Grossgartach,Germany,Buried in Schluctern Lutheran Church Cemetery,Grossgartach,Germany.
Married Anna b. ca 1563,d.8 Oct 1590 in Grossgartach,Germany,Buried in Schluctern Lutheran Church Cemetery,Grossgartach,Germany.

Children of Wendel and Anna Schnepf:
1.Anna b.16 May 1566 Grossgartach,Germany,d.24 Oct 1626 Grossgartach,Germany;bur,Schluctern Lutheran Church Cemetery,Grossgartach,Germany.M.Lorenz Nolff 6 Sep 1590,b.1563,Grossgartach,Germany
2.Hans b.6 Jan 1569,Bur,Schluctern Lutheran Church Cemetery. M.Anna Schurman 21 Apr 1594
3.Catherina b.9 Sep 1571 Grossgartach,Germany,Bur,Schluctern Lutheran Church Cemetery,Grossgartach,Germany.

The Church records for the Schnepf family should be available at the Church Rectory in Leingarten,Germany(Formerly Grossgartach).We were in Leingarten in September and got to see the Church records written in the old German script.

Hope this helps.

Best Regards,
Bill Nulph
Houston,Texas