That seems very carefully worded so as to imply that no liberals are actually Christians, even if they claim to be. Was that your intent?

Yes and no. You have to bear in mind that I regard the whole phenomenon of Christianity from the viewpoint of Rome. A Baptist, to me, is certainly a Christian, but I would have some serious issues with serious and central features of his/her faith. By the same token, anyone who subscribes to the sort of attitudes represented by President Obama - for whom, as you may have observed, I have rather more respect than most of his opponents - may sincerely believe in the Trinity, in the incarnation and resurrection of Jesus, and in personal salvation and eternal life, but I would still have huge issues with many important features of their lives.