They are are different conferences of Baptists. The conferences, like the SBC formed for the purpose of pooling rsources to send out missionaries. Between the conferences, there are differenct things emphasized. American Baptists focus more on home missions. SBC ties to do both.
Basic beliefs are the same though. and as Baptists see each church as autonomous, I don't see the that there is any issue. God uses ALL Christians.
I really think the number of denominations seem to concern certain groups, like the Catholic church, however, I just see it as that many more who are active in spreding the gospel. I see the church as being made up of believers from all denoms.