I want to share a few thoughts about what is often referred to as the "Seeker Sensitive" model. You might be surprised to learn that I do not object to this expression. I have heard many criticisms of this model over the years. One retreat speaker I heard mocked Chicago's Willow Creek (the prototype of this model) and its style of doing ministry. His criticism had to do with all of the bells and whistles evident in their worship service- the music, drama and the emphasis on being relevant. He seemed to despise "relevancy."
May I suggest that missionaries work hard to adapt to the culture they are trying to reach as much as possible, so they can build bridges to connect with the people they care so deeply about?
When modern churches use lights, fog, loud music and life-application messages to reach a segment of our culture, I applaud that.
Most of the leaders of these churches will acknowledge that if it ends there, they've failed. Willow Creek's aim was always to engage spiritual seekers and then help them become fully devoted followers of Jesus. Willow Creek introduced Lee Strobel (author of at least 17 Christian books) and his wife to Jesus! How many people have the Strobels led to Jesus? Lots!
What most of the leaders of Seeker Sensitive mega churches realize is that it is vital to connect the people they lead to Christ to an experience of Christian community through small group ministry. This can then anchor them in the faith and propel them forward to follow and serve Christ throughout the rest of their days.
One of the dangers of the House Church movement, and is often true of smaller churches that place an emphasis on personal growth, is that they are not very intentional about engaging people who don't know God. We often don't have many non Christian friends and sadly, it seems like the typical Christian doesn't want non Christian friends.
At the very least, the "Seeker" churches work hard to advance the Gospel.