In the question raised in the title, the culture of a church refers to purpose, thinking, values, worldview, content and method of communication. Some have called this the DNA of the church.
Few observers would deny that the contemporary church has less focus on and fewer expectations regarding evangelism. There is less focus on bringing people to Jesus. There is less local evangelism; there is less mission involvement. Some churches talk missional but do not reflect the missional talk in corresponding actions and activities. Is this the result of a change in the culture of the church?
Other cultural or DNA indicators can be cited. The contemporary church has fewer expectations regarding the involvement of the members in various church activities as seen in decreasing percentages of members present for Bible classes, Sunday night, and various church activities. Ministers are less likely to be consistently involved in visits and Bible studies with non-Christians or marginal Christians. When churches have special events, especially evangelistic events, many do well to have 10% of the members present. This contrasts with a time when Christians would drive a hour to two each way to support a gospel meeting or special event at another congregation.
To what can we attribute this change? Why is there less emphasis on evangelism and involvement? What has changed? What are the dynamics of culture? How do you evaluate the culture of a church? Behaviors usually change because beliefs and expectations have changed.
Until we admit that something is changing and try understand what that is, it is unlikely that we will be able to do much about it!