i don’t think i said baptists are a branch of Lutherans. only hinted that Zinzendorf converted to it. Luther and Lutheranism is the the only protestant church because it was a protest movement against the catholic church. some churches grew out of that movement. baptists however did not. that’s why i mentioned Zinzendorf.
Moravians predated the birth of Martin Luther therefore were not a product of any “protest” attributed to Luther. They even had difficulties with the Lutheran State Church once that came to pass. They’ve reached a certain rapport with Lutherans in the United States however, as well as a certain rapport with the Eastern Orthodox by whom their ancestors were converted. Baptists arose via a different path entirely.