I came across a great resource that will definitely help you out to do genealogy research in churches, it is titled “Guia de Los Archivos de la Iglesia en Espana” in English it is Guide to the Church Archives of Spain.
It is very useful since I have lately been getting more and more interested in researching for my ancestors that were from Spain.
It is a 1044 page eBook about the Church Archives of Spain.
It is very detailed and it provides the researcher with a listing of what is available and whether it has been microfilmed or not. It will also provide you with information as to where to access these records.
The best thing to do would be to use CTRL+F to search for the church, parish, or locality that you are currently researching and get the full scope of the records and years that you can expect to find there.
Don’t stop there! Get creative and search to see if familysearch.org has those microfilms available online.
Cover of the book Guia de los Archivos de la Iglesia en Espana (Guide to the Church Archives of Spain):
Link to download your own copy Guide to the Church Archives of Spain:
I know this resource will be of great help to you and me.
Let me know in the comments if it does help you out.
Also, let me know about your experiences researching records in Spain and or other resources that you may be using. Have fun!