James is talking about unfaithfulness to the Lord.<p>Since our Lord is SpiritSoulAndBody it is possible to be unfaithful -> to His Spirit -> to His Soul and -> to His Body <p>A person is unfaithful to the Holy SpiritOfChrist Jesus by entertaining evil spirits.<p> A person is unfaithful to the Soul of Christ by denying His Word. <p> A person is unfaithful to the Body of Christ by adding works to Grace.