Mark 16:16 says, “He that believeth and is baptized shall be saved; but he that believeth not shall be damned.”
Assuming that water baptism is meant, then the Mormon needs to explain the second half of the verse. If belief plus baptism truly equals salvation, then why wasn’t this formula used when it says that a person who “believeth not” would be condemned? To support the LDS position, this passage should read: “he that believeth not and is baptized not shall be damned.” Taken at face value, this says that a lack of belief, not a lack of water baptism, is what damns a person. This certainly would be supported by the rest of Scripture (see Acts 4:12; 16:31; Rom. 10:9–10).