Rootsweb, I think, is an underused source for genealogy. I found my husband's family story in Arkansas by just reading a partial county history. Closer to home, I searched the rootsweb site and found the births of Cameron County since 1924. This was a treasure considering I had not found birth certificates for some family members. The date helped tremendously. I was then able to look for baptismal records.
Our local Catholic church requires the exact day of the baptism to look for the record. As you know, that is impossible to know.