Book is about the last of 'true' humans (i think). At some point in past genetic engineers created mutants for space exploration and 'gods' who were able to manipulate energy. These gods claimed different planets. Some (or all?) of them were tyrannical. Young human man and women are having a baby who will be more powerful than the 'gods'. Can remember the cover art. Shows a young man standing over a crouching young woman on the left side of the cover. On the right side a cyclopian mutant is projecting a ray from its eye at the young man. The young man has a aura around him and a surprised look on his face as the ray is deflected away from him. Don't know why but this is driving me crazy. Can anyone recall the title or author of this book? PLEASE?