text: The Landmarkists held that this sect maintained an unbroken line of continuity since Apostolic times.
full_question: The Landmarkists held that this sect maintained an unbroken line of continuity since Apostolic times.The issue of whether or not to adhere to a Calvinist soteriology divides the "General" and "Reformed"sects within this denomination. This denomination believes in soul competency, two church offices, andtwo ordinances: the Lord's Supper and the (*) "believer's" form of a certain practice. The first congregation ofthis denomination in North America was established in Providence by Roger Williams. In 2012, Fred Luter waselected as the first African American president of the Southern Convention of this denomination, the largestProtestant group in the US. For 10 points, name this denomination that advocates performing the namesakesacrament by total immersion. 
first_sentence: The Landmarkists held that this sect maintained an unbroken line of continuity since Apostolic times.
raw_answer:  Baptists [prompt on Protestantism; accept word forms; accept specific types, such as Southern Baptist Convention]