The fastest growing churches are Jehovah’s Witnesses, seventh Day Adventism, Mormonism, and the various born again evangelical movements like Calvary Chapel and the International Churches of Christ. a lot of the people moving into these sects are former Catholics. I don’t think they are leaving because the Catholic Church isn’t liberal enough.
Adventism is the fastest growing:
If these practices sound quaint or antiquated, think again. They’re hallmarks of the Seventh-day Adventist Church, the fastest-growing Christian denomination in North America.
Newly released data show Seventh-day Adventism growing by 2.5% in North America, a rapid clip for this part of the world, where Southern Baptists and mainline denominations, as well as other church groups are declining. Adventists are even growing 75% faster than Mormons (1.4 percent), who prioritize numeric growth.
For observers outside the Seventh-day Adventist Church, the growth rate in North America is perplexing.
“You’ve got a denomination that is basically going back to basics … saying, ‘What did God mean by all these rules and regulations and how can we fit in to be what God wants us to be?’,” said Daniel Shaw, an expert on Christian missionary outreach at Fuller Theological Seminary in Pasadena, Calif. “That’s just totally contrary to anything that’s happening in American culture. So I’m saying, ‘Whoa! That’s very interesting.’ And I can’t answer it.”
Seventh-day Adventists are asking a different question: Why isn’t the church growing much faster on these shores, which is home to just 1.1 million of the world’s 16 million Adventists? Despite its North American roots, the church is growing more than twice as fast oversea
This source says the Witnesses are actually the fastest growing, along with Pentecostal, while mainline Protestant demoninations are in decline:
According to a report by the National Council of Churches, the biggest losers are the mainstream Protestant churches – the Presbyterian Church, Methodists and Lutherans are all showing a dip in membership.
While each of them are down just a few percentage points (the data was compiled in 2009 and reported to the council in 2010) the declines have reached into the double digits over the last decade. Some of them are responding with ad campaigns.
“I think one of the things about mainline is that because it was the dominant church for so long, it took for granted that it would be publicly valuable,” said Rev. Serene Jones of the Union Theological Seminary. “To suddenly find yourself no longer the big guy on the block, meaning you suddenly have to start figuring out who you are and explain yourself.”
Pentecostal churches, on the other hand, are seeing a surge in membership. About 150,000 more people are attending the services this year, where members believe that the Holy Spirit can give you gifts, like speaking in tongues. Sarah Palin famously used to attend.
The closer a religion is to being just secularism with an amorphous belief in God, the less likely it’s going to be to hold on to adherents. THe less likely it will be relevant. If catholicism just endorses secular values, what is the point of the church? We already have MTV for that.