Michael Bishop 
Funeral for the Eyes of Fire [EPUB ebook] 

It seemed like a good idea; even a noble experiment. But the outcome was sheer hell. When the Balduin brothers escaped from the tedium of the human hive of Atlanta, Georgia, they had a mission. They were to voyage to the planet Trope, contact a tribe there known as the Ouemartsee, and transport it to Glaparca for a useful purpose.But suddenly the Balduin brothers discovered that they were in the slave trade, and that the Ouemartsee had made one of them a God . . .