I am not saying that a person must explicitly affirm biblical inerrancy to be a Christian.
What I am trying to say is summed up by Vincent Chang in his article "Biblical Inerrancy not Optional" by stating: "But once a person knows that the Scripture claims to be inspired, inerrant, and infallible, if he rejects the doctrine of inerrancy, but still claims to believe the gospel, then this can only mean that his faith rests on his own opinion and judgment, and not on the promise of God as revealed in Scripture. Rather than trusting God’s revelation, this person stands in judgment over it, affirming portions of it while rejecting other parts, so that his faith ultimately rests in himself, not God’s power and wisdom." (Vincent Cheung, )
See: Biblical Inerrancy Not Optional by Vincent Cheung