The Night Church - Whitley Strieber

In the Night Church, on the altar of the true church, no one will see the rape, no one will hear the screams of ecstasy — no one except the devil's disciples...
She is young, incredibly desirable, the virgin bride. He is young, incredibly brilliant, the devil's groom. They are genetically perfect, programmed to plant a seed of flesh, destined to breed a mutant life — of overwhelming beauty and overwhelming evil. Evil which will emerge as the anti-human, evil which will use cold, sinister technology to wipe out the world — our world. Now it is a matter of life and death. For them. For us. For humankind.
"The Night Church is wild. Whitley Strieber is probably the most original of the new wave of horror writers." — Peter Straub