The purpose of a church is NOT to save sinners. The purpose of a church is to #1, praise God, and to provide fellowship, support and strengthen the faith of those who are saved.
Those who are saved are supposed to witness to others, and most Christian churches have an open door policy when it comes to bringing in the unsaved; we like to see people in our churches, hearing the word, because through the Word comes salvation. But the primary function of a church isn't to "save" sinners, nor is the implication that those who are "saved" aren't sinners. THat is the universal appeal of the Christian church...the recognition that we are all sinners, every single one of us. We are saved through faith and faith alone. The desire to be good comes with being saved...but nowhere in the Bible does it say that those who are saved are not still sinful, and nobody except someone who is completely ignorant of Christianity would ever try to imply that. Every human is a sinner, and Christians recognize this.
I get tired of being called a "hypocrite" because I don't act the way non-Christians think I should. That doesn't make me a hypocrite, it makes you ignorant because you don't understand Christianity.