I'm not very religious myself, are you a religious person? Do you know anything about the Southern Baptist Convention?
Yes, The Southern Baptist Convention is a denomination of Christianity in the US
Is it one of the bigger denominations or is it just a small niche? I think I've heard of Southern Baptists before, not sure though.
It has more than 15 million members and is the largest Protestant denomination in the US
Wow I had no idea, do you know how it differs from some of the other Protestant denominations?
Originally, the Southern Baptists split from the Northern Baptists over the issue of slavery in 1845
Well that certainly was a dividing issue at the time, which side was opposed to slavery?
United States who split with northern Baptists over the issue of slavery, specifically whether Southern slave owners could serve as missionaries. After the American Civil War, another split occurred when most freedmen set up independent black congregations, regional associations, and state and national conventions, such as the National Baptist Convention, which became the second-largest Baptist convention by the end of the 19th century. 
Since the 1940s, the Southern Baptist Convention has shifted from some of its regional and historical identification. Especially since the late 20th century,
a member of the World Council of Churches and has about 130,000 members.
The Evangelical Fellowship of Thailand (EFT) is an evangelical umbrella organization that includes many smaller denominations, churches, missionary organizations, and parachurch ministries. It is not a denomination, but a collection of different groups for the purposes of reporting to the government and inter-denominational co-operation. 
The Thailand Baptist Convention is a small denomination of Baptist churches that was started by American missionaries from the Southern Baptist Convention.
There are also many