The following is from Ben Stratton of the Landmark Southern Baptist yahoo group list. It expresses the reason for our refusal for accepting the “baptism” from other denominations who do not scripturally baptize.
“To accept as valid the baptism of those holding the ‘strange doctrine’ that baptism is a necessary part of salvation, or who practice a variety of modes (sprinkling, etc.) is a gross indignity to the simple ordinance given by Jesus for believers as a testimonial of their relation to Christ in His ‘death, burial, and resurrection.’ The practice of accepting as valid the baptism of churches other than Baptist is commonly known as ‘alien baptism.’ Generally, Southern Baptist churches do not accept into membership those coming from other denominations, except by baptism; but those who do are guilty of contributing to the indignity of this ordinance as sanctioned by unscriptural churches.” John M. Snawder(John M. Snawder was pastor of the Ralph Avenue Baptist Church in Louisville, KY in the 1950’s. The above quote is from his article “The Dignity of Baptism” which appear in the Western Recorder on August 27, 1959. Notice that while Snawder pastored near the Southern Baptist Theological Seminary, which was a hotbed of liberalism in the 1950’s, he stated that the majority of Southern Baptist churches rejected alien baptism.)