Is faith in Messiah necessary to the content of saving faith in the Old Testament as it is in the New? While the dispensational tradition has been clear that salvation in every age includes a common object (God), a common basis (Christ's death), and a common requirement (faith), it has not always agreed on the content of saving faith across the testaments. Written within the dispensational tradition, One Gospel seeks to advance the discussion by looking at Paul's use of the Abraham story in Romans 4. This work contends there is continuity between the Old Testament and the New as illustrated by Abraham and Paul. The content of saving faith must always include faith in Messiah, who, in the progress of revelation, is identified as Jesus Christ.