why did touchstone do not conduct his marriage from oliver martext

Because Jacques tells him that this Oliver Mar-Text would make a botch-job of it in the forest. They should proceed to a real church and get a good priest to do it.

Touchstone does not conduct his marriage with audrey from oliver martext ,as ,Jacques tells him that he is not a good priest and would not do the real processions as are done in a marriage ,and would just marry them as two pieces of wood are joined together ,and after some time ,the wood pieces twist and fall apart ,the same way ,if he gets oliver martext as a priest for his marriage ,the same would happen to him and his wife .