The Naked God
From back cover Warner paperback November 2000:

RETREAT OF THE RESURRECTION

Faced with an interstellar war in which the only weapon is exorcism, the Confederation dissolves into anarchy.  For in a desperate act of triage, a few wealthy worlds prepare to sacrifice the mass of humankind to the risen dead souls from the Beyond.  Meanwhile, the Possessed are destroying whole planets as they flee the universe in a transdimensional quest to find Heaven.

But there are far worse things than death -- or resurrection.  And the Possessed are about to discover that chasing paradise is the most horrific, irrevocable mistake they could make.
Fiction, science fiction, space opera, Fiction, science fiction, hard science fiction, The Future, Imaginary wars and battles, Interplanetary voyages
Peter F. Hamilton
Peter F. Hamilton (born 2 March 1960) is a British author. He is best known for writing space opera. As of the publication of his tenth novel in 2004, his works had sold over two million copies worldwide.

Source: Wikipedia