Seems odd to me, but that’s what’s happening this summer at the Fellowship of Presbyterian’s ECO conference. ECO was founded last year by a group of PC(USA) pastors who were concerned about the direction the PC(USA) was headed. However, while the ECO may be the more “conservative” of the PC(USA) group, they still hold to two main tenets of the PC(USA) that were part why the PCA separated from the old PC(US).
Specifically, they hold to a different view of the inerrancy of Scripture and the ordination of women. Here are quotes from the FOP/ECO values page:
Biblical Integrity: We believe the Bible is the unique and authoritative Word of God, which teaches all that is necessary for faith and life. The prominence of God’s Word over our lives shapes our priorities, and the unrivaled authority of the Bible directs our actions to be in concert with Christ’s very best for our lives.
Egalitarian Ministry: We believe in unleashing the ministry gifts of women, men, and every ethnic group.
So, why would Dr. Tim Keller, a PCA pastor and complementarian, be invited to speak to group who disagree on two fundamental issues?
A Daughter of the Reformation 
Exactly. I think we can understand it if we see what his version of “mere Christianity” means.
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