The real problem with the "seeker" movement, the "emergent" church, the "social gospel" churches isn't so much their lack of truthful preaching, though that is certainly a major problem they should correct, or abandon the idea of calling themselves a "church."
The real problem is they all try to draw the sinner into the last place on Earth a sinner is going to go willingly so they can hear the Gospel. It isn't the church's job to convert sinners! It is the church's job to equip their members to convert sinners!
People are fond of saying "The church isn't a place for saints, it's a place for sinners." But that isn't true! The church is where the imperfect believers worship, fellowship, study God's word, praise His holy Name, and learn how to make disciples of their friends, co-workers, and family.
To do that, the church has to preach the Gospel, teach the life applications of the Gospel, and do so in such a way that people can take the message out into the world.
We can't approach the problem of sin and redemption from a human perspective. As long as those churches cling to the idea of making themselves "less of a threat" to sinners, they are going to invite sin into the church, instead of inviting Christ into the sinner.
The Gospel is a threat. It is a "stumbling block" for those in the world. If it wasn't, then Satan wouldn't hate it so much, and try to get his own into churches to turn them into entertainment galleries rather than worship centers.