This study seeks to demonstrate the Pauline phrase Pistis Khristou is best understood grammatically as the 'Christ faith' in accordance with the so-called 'third view' where 'faith' is taken to mean a system or set of beliefs, and 'Christ' qualifies what the system is about. I argue that the grammar disallows the meaning 'faith in Christ' where Christ is the object of one's 'trust', since objective genitive can only mean 'belief of something (to be true)', as is shown by an analysis of the data in the NT and in Harrisville 1994; 2006. Additionally, the subjective genitive rendering often fails to make sense within the literary context and faces its own grammatical difficulties. Drawing on work from theoretical linguistics in lexical semantics and syntax, I show that the third view meaning, translated as the 'Christ-faith', is the most likely rendering given the context of each of the passages, the Greek case system and the meaning of the noun pistis as used in the NT and other Koine Greek writings.