Records of Tenamaxtlan prior to 1757

Has anybody researched in the area around Tenamaxtlan, Jalisco? I'm trying to locate an ancestor who was born in this feligresia in or around 1751, but the baptisms seem to begin in 1757 for this parish.

Juana Maria Sanchez (sometimes spelled Sanchis) was married on 21 apr 1765 to Juan Bautista Macedo in San Joaquin, (found in the Guachnango films). According to the matrimonial information, she was born in Tenamaxtlan around 1751. Her parents were Nicolas Sanchez and Manuela Espinoza. I've been able to find several of her siblings after 1757, but not her baptism, much less her parents marriage. Where did the people of Tenamaxtlan register before the parish was established? I would assume Atengo and Tecolotlan, being the closest towns, are my top choice. But it seems that the Atengo records have not been microfilmed! For now, I'll start browsing the films in Tecolotlan hoping to find Nicolas Sanchez and Manuela Espinoza's marriage. If anyone has some additional advice, I would greatly appreciate it.

Steve in NC