Thestoryof"TheExorcismofGod"followsfather"PeterWilliams",anAmericanexorcistwho,beingpossessedbyademonhewastryingtoexpel,endsupcommittingthemostterriblesacrilege.Eighteenyearslater,theconsequencesofhissinwillcomebacktohaunthim,unleashingthegreatestbattleagainsttheevilwithin.