To be honest, I don't know that any Southern Baptist churches combine the two things. Baptism is to show that you are a Christian...washing away the old man, become new in Christ. To become a member after that, you have to request membership. There are often membership classes so that you can learn what the Baptist church believes (and you can take these without become a Baptist either....you can take them to just understand the Baptist beliefs.) No one will be standing at the other end of the baptismal with a membership card. You are safe. 
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