The Creators by Rick Moskovitz
A teenaged Natasha Takana seeks to decode the remainder of the hidden DNA code that became the basis for a new religion reviving Creationism in A Stand-in for Dying. Her quest takes her on a voyage to a parallel dimension to learn the fate of the Creators’ civilization. In the course of successive visits to their watery world, she finds herself transformed, a bridge between our world and theirs.
The conflict between Ganymede and Mandala, the warring factions of Brink of Life is rekindled, sweeping Natasha into the middle of it in a pursuit that crosses the boundaries of worlds and time.