My concern is that many of our churches in America have gone from being sanctuaries to becoming stadiums. And every week all the fans come to the stadium where they cheer for Jesus but have no interest in truly following Him. The biggest threat to the church today is fans who call themselves Christians but aren't actually interested in following Christ. They want to be close enough to Jesus to get all the benefits, but not so close that it requires anything from them.
Kyle Idleman, from his book, "Not a Fan," as taken from Tim Challies' blog