In The Gravedigger File, Os Guinness lists four steps for introducing liberal ideas into the church.

1. Assumption: Some aspect of modern thought (such as evolution) or behavior is assumed to be superior to traditional Christian beliefs.

2. Abandonment: That which is considered old-fashioned or inconsistent with modern thought is abandoned.

3. Adaptation: Truth is redefined and traditional beliefs are altered to accommodate the new teaching.

4. Assimilation: As the new teaching takes root, it develops into full-blown compromise or worldliness and Christianity surrenders to some aspect of the culture of its day.

I have seen this downward progression in so many churches. It serves as a warning to me.