This article is a response to the recent work of Michael F. Bird and Michael R. Whitenton, in which they argue that Hippolytus's De Christo et Antichristo provides a clear instance of a subjective genitive πίστις Χριστοῦ construction and unambiguously identifies πίστις as Jesus' death on the cross. However, in light of (1) a significant textual variant, and (2) the role that πίστις plays in Hippolytus's theology of martyrdom, the construction in fact supports the reading of an objective genitive.