Question: What is the average weekly attendance at the church founded by the author of The Purpose Driven Life ?

full_context: Document 1: Rick Warren: Richard Duane "Rick" Warren (born January 28, 1954) is an American evangelical Christian pastor and author. He is the founder and senior pastor of Saddleback Church, an evangelical megachurch in Lake Forest, California, that is the eighth-largest church in the United States (including multi-site churches). He is also a bestselling author of many Christian books, including his guide to church ministry and evangelism, "The Purpose Driven Church", which has spawned a series of conferences on Christian ministry and evangelism. He is perhaps best known for the subsequent book "The Purpose Driven Life" which has sold more than 30 million copies, making Warren a "New York Times bestselling author.
Document 2: Southern Baptist Convention: The Southern Baptist Convention (SBC) is a Christian denomination based in the United States. With more than 15 million members as of 2015 , it is the world's largest Baptist denomination, the largest Protestant denomination in the United States, and the second-largest Christian denomination in the United States after the Catholic Church.
Document 3: Rock Church (San Diego): Rock Church is an evangelical megachurch located in San Diego, California, with five campuses located in Point Loma, San Marcos, El Cajon, San Ysidro, and City Heights. Miles McPherson, a former NFL player, has served as senior pastor since he founded the church in 2000. With an average weekly attendance of more than 19,000 as of January 2016 at four weekly services at each campus, as well as live online streaming, the Rock is one of the largest churches in San Diego.
Document 4: Rob Bell: Robert Holmes "Rob" Bell Jr. (born August 23, 1970) is an American author, speaker and former pastor. Bell was the founder of Mars Hill Bible Church located in Grandville, Michigan, which he pastored until 2012. Under his leadership Mars Hill was one of the fastest-growing churches in America. He is also the author of the "New York Times" bestseller "Love Wins" and the writer and narrator of a series of spiritual short films called NOOMA. In 2011, "Time Magazine" named Bell on its list of the 100 Most Influential People in the World.
Document 5: John Piper (theologian): John Stephen Piper (born January 11, 1946) is an American Calvinist Baptist pastor and author who is the founder and leader of desiringGod.org and is the chancellor of Bethlehem College & Seminary in Minneapolis, Minnesota. Piper served as Pastor for Preaching and Vision of Bethlehem Baptist Church in Minneapolis, Minnesota for 33 years. His books include ECPA Christian Book Award winners "Spectacular Sins", "What Jesus Demands from the World", "Pierced by the Word", and "God's Passion for His Glory", and bestsellers "Don't Waste Your Life" and "The Passion of Jesus Christ". The evangelical organization Desiring God is named for his book "Desiring God: Meditations of a Christian Hedonist" (1986).
Document 6: The Purpose Driven Church: The Purpose Driven Church (1995) is a book written by Rick Warren, founder and senior pastor of Saddleback Church in Lake Forest, California, United States. It was published in 1995, subtitled ""Growth Without Compromising Your Message & Mission"." In a May 2005 survey of American pastors and ministers conducted by George Barna, "The Purpose Driven Church" was voted as the second book most influential on their lives and ministries, behind "The Purpose Driven Life", a subsequent book by Rick Warren.
Document 7: Perry Noble: Perry Noble (born June 24, 1971) is an American preacher, author, and the former senior pastor at NewSpring Church, a megachurch located in Anderson, South Carolina. His weekly sermons were watched by over 32,000 people at 11 satellite campuses across the state of South Carolina with an additional 7,200 viewers tuned in weekly via online live stream. He has gained notability as the senior pastor at the largest church in the South Carolina Baptist Convention and second fastest-growing church in the United States. Noble gained notoriety for controversial remarks made regarding the Ten Commandments during a Christmas Eve service at his church, as well as his forced removal from the church as pastor.
Document 8: Southland Christian Church, Lexington, Kentucky: Southland Christian Church is an evangelical Christian church whose first campus is located in an unincorporated area of Jessamine County, Kentucky, which is just outside Lexington, Kentucky, United States. The church, which has a Nicholasville mailing address, is located at the corner of U.S. Route 68 (Harrodsburg Road) and Brannon Road. The church has three additional campuses—one in Danville, one at the former site of Lexington Mall on Richmond Road in Lexington, and in Georgetown north of Lexington. It is associated with the Christian churches and churches of Christ. Its current Senior Pastor, Jon Weece, came to the church as a teaching pastor in 2000, and became Lead Follower in 2003.
Document 9: John Ortberg: John Ortberg, Jr. (born May 5, 1957) is an evangelical Christian author, speaker, and senior pastor of Menlo Church in Menlo Park, California, an ECO Presbyterian church with more than 4,000 members. Ortberg has published many books including the 2008 ECPA Christian Book Award winner "When the Game is Over, It All Goes Back in the Box", and the 2002 "Christianity Today" Book Award winner "If You Want to Walk on Water, You've Got to Get Out of the Boat". Another of his publications, "The Life You've Always Wanted", has sold more than 500,000 copies as of 2008. On August 13, 2012, John Ortberg's book "Who Is This Man?" debuted at #3 on the New Release chart at Amazon.com.
Document 10: Tullian Tchividjian: William Graham Tullian Tchividjian, commonly known as Tullian Tchividjian (pronounced TUHL-ee-uhn cha-VI-jin; born July 13, 1972), is a deposed pastor originally in the Presbyterian Church in America denomination, and author of more than a half dozen books about Christianity and current issues, including "One Way Love" and "It is Finished" (David C. Cook, 2013 and 2015). A grandson of Christian evangelist Billy Graham, Tchividjian founded an Evangelical Presbyterian Church congregation before being tapped to merge it and become the second senior pastor of Coral Ridge Presbyterian Church in Fort Lauderdale, Florida (after the church's late founder and longterm leader, D. James Kennedy). Serving 2009-2015, Tchividjian resigned after allegations of an extramarital affair, the first of more than one to which he would admit, the initial admission being sufficient for his being deposed by his denomination as unfit for Christian ministry. In addition to his book publications, Tchividjian blogged for some time for The Gospel Coalition, has contributed to a variety of secular and Christian publications, and has appeared on a variety of major televisions news programs. As of December 2016, the Christian publisher David C. Cook remained committed to publishing Tchividjian's next book.
Document 11: The Purpose Driven Life: The Purpose Driven Life (2002) is a devotional book written by Christian author Rick Warren and published by Zondervan. The book topped the "Wall Street Journal" best seller charts as well as "Publishers Weekly" charts with over 30 million copies sold by 2007. "The Purpose Driven Life" was also on the New York Times Bestseller List for over 90 weeks.
Document 12: Saddleback Church: Saddleback Church is an evangelical Christian megachurch located in Lake Forest, California, situated in southern Orange County, affiliated with the Southern Baptist Convention. The church was founded in 1980 by Pastor Rick Warren. Weekly church attendance averages over 20,000 people, currently making it the fifth-largest church in the United States by attendance (this ranking includes multi-site churches).
Document 13: Coral Ridge Presbyterian Church: Coral Ridge Presbyterian Church is a Christian megachurch within the Presbyterian Church in America located in Fort Lauderdale, Florida, USA. It was founded in 1960 by D. James Kennedy (1930–2007), who served as the church's senior pastor until his death in 2007. The present church building seating 2,800 persons was dedicated on February 3, 1974 by evangelist Billy Graham. It became affiliated with the Presbyterian Church in America denomination on May 16, 1978; Coral Ridge was originally a member congregation of the Presbyterian Church in the United States, the so-called "Southern" church before 1983.
Document 14: Southeast Christian Church (Louisville, Kentucky): Southeast Christian Church is an evangelical Christian church based in Louisville, Kentucky. It is considered to be a megachurch. s of 2013 , it is the seventh-largest church in the United States.
Document 15: Bayside Church (Sacramento region): Bayside Church, formally known as Bayside Covenant Church, is a family of churches and venues centered on its primary campus in Granite Bay, California United States, which is referred to as the Granite Bay campus. The church is led by Senior Pastor Ray Johnston, Senior Pastor Curt Harlow and Senior Pastor Andrew McCourt, and Senior Pastor Lincoln Brewster. John Jackson, the former executive pastor at Bayside, became the president of William Jessup University on March 23, 2011. Bayside is one of the largest churches in the Sacramento metropolitan area. It is affiliated with the Evangelical Covenant Church.
ground_truth: over 20,000