Good thinking is based on being well informed. Here are some resources for your further research:
On line reviews:
Wikipedia article (well researched!): http://en.wikipedia.org/wiki/Cristero_War
Pope Pius XI's encyclical INIQUIS AFFLICTISQUE on the persecution of the Church in Mexico (18 November 1926, shortly after the fighting had begun)
Two other movies about the Cristiada:
- Los Cristeros, or Sucedió en Jalisco (1947) - by Raúl de Anda - a wonderful but now almost forgotten movie - IMDb info
- Los últimos Cristeros (2011) - a new Mexican film by Matías Meyer, excellent - official homepage
Two well researched books or articles:
- David C. Bailey. Viva Cristo Rey! The Cristero Rebellion and the Church-State Conflict in Mexico (1974); 376pp; a standard scholarly history. Available here from University of Texas Press.
- Ramon Jrade. "Inquiries in the Cristero Insurrection against the Mexican Revolution", in Latin American Research Review Vol. 20, Nr. 2 (1985) pp. 53-69. Available as online PDF here.
Finally, from a theological point of view, I cannot help thinking that Graham Greene's novel The Power and the Glory (1940) is the finest work of literature about the Cristero Revolution. (B. Traven's novel Treasure of the Sierra Madre from 1927 is set in Mexico during the Cristero Uprising but the author shows no understanding of what is going on - so it's just as well that the 1948 John Huston movie starring Humphrey Bogart fails to mention the Cristeros with a single word, though we see them fighting and dying in the background as American gringos do their Hollywood thing). If you really want to explore the moral implications of the Cristero War, read Graham Greene! Here is the Cliffnote version. Here is a good essay.