 The migrations and missionary efforts of each of these groups lead to the widespread significance of the Westminster Assembly throughout the English @-@ speaking world . The Assembly 's Confession was particularly influential in American Protestant theology . It was included with congregationalist changes as part of the 1648 Cambridge Platform , a statement produced by ministers of colonial Massachusetts and the surrounding region , and again in colonial Connecticut as part of the 1708 Saybrook Platform . The Confession was modified for American Baptists in the 1707 Philadelphia Confession . The Adopting Act of 1729 required American Presbyterians to agree to the theology of the Assembly 's Confession , and the Confession remains a part of the Presbyterian Church ( USA ) ' s Book of Confessions . The Confession has been called " by far the most influential doctrinal symbol in American Protestant history " by the historian of religion Sydney E. Ahlstrom . 
 The migrations and missionary efforts of each of these groups lead to the widespread significance of the Westminster Assembly throughout the English @-@ speaking world . The Assembly <a href='null_genetive' title='1'><mark>'s</mark></a>Confession was particularly influential in American Protestant theology . It was included with congregationalist changes as part of the 1648 Cambridge Platform , a statement produced by ministers of colonial Massachusetts and the surrounding region , and again in colonial Connecticut as part of the 1708 Saybrook Platform . The Confession was modified for American Baptists in the 1707 Philadelphia Confession . The Adopting Act of 1729 required American Presbyterians to agree to the theology of the Assembly <a href='null_genetive' title='2'><mark>'s</mark></a>Confession , and the Confession <a href='uninflect' title='3'><mark>remains</mark></a> a part of the Presbyterian Church ( USA ) ' s Book of Confessions . The Confession <a href='been_done' title='4'><mark>has</mark></a> been called " by far the most influential doctrinal symbol in American Protestant history " by the historian of religion Sydney E. Ahlstrom . 
The migrations and missionary efforts of each of dese groups lead to the widespread significance of the Westminster Assembly throughout the English @-@ speaking world . The Assembly  Confession was particularly influential in American Protestant theology . It was included with congregationalist changes as part of the 1648 Cambridge Platform , a statement produced by ministers of colonial Massachusetts and the surrounding region , and again in colonial Connecticut as part of the 1708 Saybrook Platform . The Confession was modified for American Baptists in the 1707 Philadelphia Confession . da Adopting Act of 1729 required American Presbyterians to agree to the theology of the Assembly  Confession , and tdaConfession remain a part of thdaresbyterian Church ( USA ) ' s Book of Confessions . Thedanfession done been called " by far the dat influential doctrinal symbol in American Protestant history " by the hdaorian of religion Sydney E. Ahlstrom .