Wernecke attended Milwaukee State Teachers College, Mission House (now Lakeland), Southern Baptist Seminary, Hope Seminary, and Princeton Seminary. He taught Religious Education at Central Theological Seminary and at Eden Theological Seminary, Webster Groves, Missouri, after the two schools merged. His works include:
- Carols, Customs and Costumes Around the World (Webster Groves, Missouri: The Old Orchard Book Shoppe, 1936)
- Through Four Centuries: The Story of the Beginnings of the Evangelical and Reformed Church, with
Julius H. Horstmann (Saint Louis, Missouri: The Eden Publishing House, 1938)
- The Book of Revelation Speaks to Us (Philadelphia, Pennsylvania: Westminster Press, 1954)
- Christmas Customs Around the World, 1959
- Tales of Christmas from Near and Far, 1963
- Celebrating Christmas Around the World
- When Loved Ones Are Called Home