The Bene Gesserit

We are still left with an unclear idea of what the Bene Gesserit hope to accomplish with their imbreeding of the house lines. What is their final goal in creating their perfect human? The Bene Gesserit seem to suffer from goal displacement. At one point they problably imagined what they wanted this saviour to do, but the details of it have been lost in the focus on the process. The selective breeding and manipulation of the Houses bacme such a consuming part of their existance that they forgot the end goals. This is hardly an unusual thing to happen to any institution or beaurocracy, as can be paralleled in growth complex theory of correctional institutions and the criminal justice system.
What does this mean if the prophesized saviour cannot be recognized by the prophets and the searching in his time? Are all saviours supposed to walk this line of disbeliefs, believed only by their close followers? This opens an interesting parallel with an almost Jesus like figure set in an Islamic religion. Again, on the idea of a Messiah, can the people whom the Messiah is to save recognize their saviour? I don't think so