John Piper has preached his last sermon as pastor of Bethlehem Baptist Church. The famed author and speaker now plans to devote most of his time to DesiringGod.org and Bethlehem College and Seminary. Jason Meyer, a New Testament professor at the school, will be replacing Piper as head pastor of the church. David Mathis wrote in a blog post that “It’s the end of an era — the era of Piper as local-church pastor — but God willing, just the beginning of a new season of ministry” …