Film set in tropical Central or South America. Similar setting as "Apocalypto", "Fitzgaraldo" and "Aguirre Wrath of God". There is a scene where some hero type is fighting a highly trained local warrior-priest. When the priest is fatally wounded he cuts out his own heart and holds it in both hands in front of his body as an offering to his Gods. I think I saw this on HBO or Cinemax in the 1980s or 90s.