According to the National Church Life Survey, the number of people who attend churches in Australia on any given Sunday declined by about 7% between 2001 and 2006, after declining by a further 7% between 1996 and 2001. Mainstream denominations bore the brunt of the declines, whereas Pentecostals saw small increases.
One possible reason is that Pentecostals are the only ones being faithful to God. A more likely reason, in my view, is that most churches perform poorly when it comes to doing what churches are supposed to do. We keep telling people that it is essential for Christians to be members of local churches, but the reasoning is somewhat confused. Usually the reason given is something to do with fellowship, but often the quality of fellowship on offer isn’t that great.
The real reason why followers of Jesus must team up with other believers is because Christians are designed by God to work in teams. Churches which can find ways of linking believers together in teams to do productive ministry will be growing churches, regardless of denominational affiliation or theological inclination in respect of non-core beliefs. Non-Pentecostal churches in Australia just need to do a better job of putting people to work.