Are you seriously contending that Southern Baptists abandoned racism "long before" 1978?
Do you remember the history of the 60s and 70s at all? Most white southerners, many of them Baptists, had to be dragged forcibly into recognition of equal rights during this period.
The Southern Baptists didn't formally apologize for their history of racism and support of slavery until 1995. FWIW.
I am not a fan of Mormonism. Just opposed to claims that they were uniquely guilty of racism, a sin of which just about all American churches have been guilty, with abandonment of this unbiblical doctrine at various times by different churches, some of them not long at all before the Mormons capitulated on the issue.
#1...are you seriously claiming that ALL Southern Baptists as of the 1950s and 1960s resided in the South? Really? Do I need to give you a demographic decade by decade of where Southern Baptists, %-wise, resided state-by-state? Do you realize how many Southern Baptist churches exist outside of the South? (Even outside of the U.S.?) What isolated hole do you live in to make such a contention?
#2...are you seriously claiming that ALL Southern Baptists living in the South towed the KKK line of the 50s & 60s? Really? What "proof" do you have of a given %?