D. G. Hart has this interesting comment in his biography of J. Gresham Machen:
The hallmark of liberalism was a conscious adaptation of religious ideas to modern culture and the affirmation that God was immanent in human history and was establishing a righteous kingdom through social progress.
D. G. Hart, Defending the Faith, p. 103
When you hear the call today to change the message of the gospel because the culture has changed it makes you wonder how this can be different to what the liberal theologians proposed. I guess it isn't all that different at all.