The problem with liberalism and true Christianity is that, at their core, they are diametrically opposed. Liberalism says, “People are essentially good and will be able to create a utopian or near utopian society one day because of that innate goodness.” However, TRUE Christianity says, “There is NONE righteous, no, not one,” and, “All have sinned and fall short of the glory of God,” and “Humans’ hearts are desperately wicked,” and the only holiness we can have comes from Jesus’ sacrificial death for us, “No man comes to the Father, except through me.”
In addition, to imply or to explicitly say that conservatives do not care about the poor, the down-trodden, or the broken, is false. To imply that liberals, because of their support of governmental social programs, care more about those aforementioned people, is also false. You see; true, hands-on caring like Jesus exhibited, doesn’t come through involuntary taxes that are sent indirectly to someone through a vast government of bureaucracy, but rather, that Christ-like caring comes through individuals and churches. Do some churches and Christians fail at this? Absolutely! But do many churches and many Christians excel at this? Absolutely!
You believe and make a fallacious argument in that you equate the support of governmental social and welfare programs with “true,” Christ-like Christianity. While Jesus did say, “render unto Caesar what is Ceasars’” He also said Christians were to be “in the world, but not of it.” He said we are to “sell all that we have and give it to the poor…” not to the government, to give to the poor. Yet, even if one wants to debate the way Jesus would react to governmental social programs and how He would view their likeness to commands in Scripture to care for the poor, that one should still have a problem being a “liberal” and a “true Christian.” That’s because in order to be a “liberal” or “Leftist” Christian, one would have to either fail to recognize, or completely ignore, the most important aspect of Christianity — the Gospel. The Left’s continual and unequivocal refusal to see humanity as fallen and in need of a savior is at complete odds with Jesus’ main mission, to die a substitutionary death to redeem fallen man.
I will also add this: if you do not believe in the fallen nature of man and his need for the sacrificial death and atonement of Jesus, then further discussion would be mostly moot.