Cal Thomas on Why Liberal Christians Aren't Christian

Here's Cal Thomas holding forth on Hilary Clinton's religious faith (HT Digby):

Liberal faith, which is to say a faith that discounts the authority of Scripture in favor of a constantly evolving, poll-tested relevancy to modern concerns -- such as the environment, what kind of SUV Jesus would drive, larger government programs and other "do-good" pursuits -- ultimately morphs into societal and self-improvement efforts and jettisons the life-changing message of salvation, forgiveness of sins and a transformed life.

If the newspaper story is accurate, this is where Clinton is on her faith: "In a brief quiz about her theological views, Mrs. Clinton said she believed in the resurrection of Jesus, though she described herself as less sure of the doctrine that being a Christian is the only way to salvation."  This is a politician speaking, not a person who believes in the central tenets of Christianity.

The same book that tells of the resurrection, also quotes Jesus as saying "I am the way, the truth and the life; no one comes to the Father but by me" (John 14:6). One might ask, which the reporter did not, that if there are other ways to God than through Jesus, why did Jesus bother to come to Earth, allow himself to be crucified and suffer rejection?

I can't quite tell what Thomas means by liberal Christianity here.  But I know I disagree with his characterization of the view that "being a Christian is the only way to salvation" as a central tenet of Christianity, unless Catholics do not count as Christians.  (Of course, we've seen that one before as well.)