It's even worse than that, as this example of an openly atheist Presbyterian illustrates:
http://www.layman.org/layman/news/2006-news/committee-investigates-membership.htm
http://www.layman.org/layman/news/2006-news/pastor-defends-admitting.htm
And thus, it's not too surprising that the latest General Assembly meeting of this "ICHABOD" denomination has produced reactions like this:
http://www.layman.org/layman/news/2006-news/evangelical-ministers-sessions.htm
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You are correct. Further, my experience is that a dwindling number of religious liberals are Christians in that many I've met no longer believe in the Resurrection or the divinity of Christ.