I like how Joseph M. Stowell answers this question in his book, Shepherding The Church into the 21st Century.
“As we have alluded, one of our great debates today is between those who hold to traditional church forms and those who are launching into new and sometimes risky contextualization to attempt to make the gathered church both compatible with and understandable to the lost in this new generation. In the conflict regarding church forms, it is held in some circles that the church gathered is not appropriate for evangelism. And while the in-house functions of the church are indeed biblically focused toward believers, it is hard to find a prohibition in Scripture about believers gathering together to effectively bring unbelievers to encounter either a pre-evangelistic or direct evangelistic message. Throughout the history of the church, and particularly during the great revival movements, Christians gathered to hear the Gospel clearly and forcefully proclaimed, praying that their unsaved friends who were there would respond. Celebrated sermons such as “Sinners in the Hands of an Angry God” were preached in church as an attempt to communicate the Gospel to the unsaved listener.”
Joseph Stowell, Shepherding the Church into the 21st Century (Wheaton, IL: Victor Books, 1994), 46-47.
