One of my historical heroes is J. Gresham Machen.
Here are a few sentences from his book Christianity and Liberalism.
In the sphere of religion, as in other spheres, the things about which men are agreed are apt to be the things that are least worth holding; the really important things are the things about which men will fight.
“Christ Died”—that is history; “Christ died for our sins”—that is doctrine. Without these two elements, joined in an absolutely indissoluble union, there is no Christianity.
The modern liberal preacher reverences Jesus; he has the name of Jesus forever on his lips; he speaks of Jesus as the supreme revelation of God; he enters, or tries to enter, into the religious life of Jesus. But he does not stand in a religious relation to Jesus. Jesus for him is an example for faith, not the object of faith.
Liberalism within the “evangelical” churches is inferior to Unitarianism. It is inferior to Unitarianism in the matter of honesty. In order to maintain themselves in the evangelical churches and quiet the fears of their conservative associates, the liberals resort constantly to a double use of language.
Here are a few lines from a very insightful article about Machen by professor Carl Trueman.
Before we see Machen as too intolerant, too much a man of a bygone age, let us reflect on the fact that we live in an age that is remarkably certain and intolerant on a whole host of fronts, from racism to poverty to cruelty against animals to homophobia. Regardless of where we come down on each of these issues, very few of us will be indifferent on them, or particularly laissez-faire towards those with whom we disagree on these matters.
Thus, it is not really that Machen is a man of a bygone, intolerant age which makes this little book so offensive to modern ears. We should not flatter our own enlightened times so easily, for it is not the reality of intolerance in itself that has changed. Rather, it is that we now have a different set of issues that arouse intolerance, and this change reflects not only shifting values in society but also in the church, to the extent that she no longer stands intolerantly for her truth as she once did. The question is thus not whether we are intolerant: we surely are. The question is rather: Are we intolerant of the right things?
As the value of religious truth has become negligible, so the passions aroused by such in the wider world have died down. That we do not fight over these things is not a virtue; it is rather be a sign that we just do not care about them any more, and that is the result of the downgrading of the Bible in our thinking.
You can click here for a picture and tiny biography http://www.tracts.ukgo.com/john_gresham_machen.htm