1) Liberal Presbyterian sects such as “Presbyterian Church U.S.A” is hardly committed to Calvinist doctrine. While the more conservative sects, “Presbyterian Church of America” and “Orthodox Presbyterian Church” are.
2) By “conservative” do you mean politically/socially conservative or theologically conservative? Sure, one can say the two are linked—but there are plenty of non-Christians (Mormons) who are politically conservative as well, it does not make their doctrines any more valid spiritually.
3) I think one of the problems with some aspects of the Arminian-based “Christian Right” is the idea that bigger government and control of secular government in general, is the answer to solving the moral and social crises facing our society. Think the views of Mike Huckabee or even Rick Warren. Hence things like tax-payer funded “faith-based” initiatives
* A strong belief in man’s ability to “be good” by his own volition can lead to the idea that human beings can improve society by virtue of their own efforts and manmade means. Which is why “free will” thinking tends to coincide with statism. While a Calvinist “total depravity” worldview will promote a skepticism of over-concentration of power in any one place or person. And oftentimes, putting too much faith in politics can lead to de-emphasis of our spiritual duties—which are unchanging regardless of who’s in charge at the secular level.
by the way - according to the Bible - and my core that follows that - we’re all sinners (’depravity’ without God’s redemption in Christ), there are none righteous. The only good that men do is by following that part of God’s law inscribed on their hearts whether they acknowledge it from God or not. Like Sarah Palin has repeatedly stated it (she being raised similarly to me) - can’t trust government ‘cause we’re all Fallen Man.
Liberal Presbyterianism, you see, moves away from Calvinism by their own free will. They could be more Calvinistic by moving towards Calvinism and putting the beliefs to use in their lives. You still have the problem of free will here and in every belief system in the churches.
Most of the time, if not all the time, Calvinism is preached to the people who are already saved. They accept it because it looks right but not all of it is.
The Jews in the Bible practiced a form of Calvinism back in the early days of the New Testament. They thought they were saved by the virtue of being a Jew (the chosen ones) but Paul says no, that everyone who has heard the gospel will have to make a decision to become born again by the Spirit of God or not.