Need to be baptized again?
If I was raised and baptized in a Baptist church and switched to a WELS church, would I need to get baptized again? The reason I'm asking is because I know that Lutherans have a different belief on baptism and how it works.
There would not be a need to be baptized again. While Baptist theology misunderstands the purpose and blessings of baptism, the baptism of such churches is a valid baptism. Water is applied in the name of the Triune God: Father, Son and Holy Spirit. That constitutes a valid baptism.
What would be necessary to join one of our congregations is to attend and complete a course of Bible information classes. Upon completion of the classes and, God willing, your profession that the information presented is what Scripture teaches, you would be confirmed as an adult. That would establish your membership in one of our congregations.
God guide and bless your study of his word!