Hi--the Spring Prairie Lutheran Church is located in Keyser, WI, which is in Columbia Co. WI. However, it is very close to the county line with Dane Co. Many of the families who attended Spring Prairie lived in Dane Co. Andrew & Anna (Flesche) Lerum did have a son named Ole Lerum & you have the right DOB, BUT he was born in Freeborn Co. MN. By 1875 the Lerums had moved to Freeborn Co.
Anders & Erik Lerum & their siblings came to WI. from Lyster, Sogn, Norway. Their parents were Eric Hanson Lerum, and wife Johanna Jonsdatter, and their records are in the Dale church in Sogn.
Your Lerum ancestor may have lived on the same farm, but I don't think they are related.
I will email you separately.