What kind of records would a Chicago Catholic parish church keep on its congregants in the early 20th century?

Archdiocese of Chicago parish records through 1915 were filmed by the Genealogical Society of Utah and the microfilms can be ordered in and viewed at any LDS Family History Center. The records may vary slightly by parish, but they generally include baptisms, confirmations, marriages, and burials. The information recorded in the registers varies by parish. For example, some marriage records include parent names but many do not. A quick way to see what's available is to follow the links to the Family History Library catalog from the POINTers in Person web page: