Here are some helpful definitions on Liberal Christianity (if you really do not know).
"Liberals view the Bible as the
witness of God rather than the
word of God. Strangely the view looks for support by a type of
literal interpretation — though this should not be confused with the form of
Biblical literalism found in fundamentalist and conservative churches — of the words of Paul in his second letter to Timothy:"
Source:
Liberal Christianity - Conservapedia
"liberal Christians placed less emphasis on miraculous events associated with the life of Jesus than on his teachings. The effort to remove "
superstitious" elements from Christian faith"
Source:
What is liberal Christian theology? | GotQuestions.org
Liberal Christianity also embraces the
evolutionary paradigm (see also:
Evolution and liberalism).
In July 2000,
Creation Ministries International reported:
“ For years, many people have scoffed at any suggestion that the evils in society could be linked with the teaching of the theory of evolution. But new research has confirmed what Bible-believers have known all along—that the rising acceptance of Darwin’s theory is related to declining morality in the community.
The research survey of 1535 people, conducted by the Australian National University, revealed that belief in evolution is associated with moral permissiveness. Darwin himself apparently feared that belief in evolution by the common man would lead to social decay. The survey showed that people who believed in evolution were more likely to be in favour of premarital sex than those who rejected Darwin’s theory. Another issue which highlighted the contrast between the effect of evolutionary ideas and that of biblical principles was that Darwinians were reported to be ‘especially tolerant’ of
abortion.
In identifying the primary factors determining these differences in community attitudes, the author of the research report, Dr Jonathan Kelley, said: ‘The single most important influence after church attendance is the theory of evolution.’"
Source:
Liberal Christianity - Conservapedia
My definition of Liberal Christianity is deeper, but I will not go into that here at extensive length. Most conservative Christians know that liberal Christians tend to disregard certain cherished moral values that the Bible teaches. Morally speaking from my experience: Liberals tend to accept abortion, magic (witchcraft), paganism, and other things. They also have been known to think of stories like Job, and Jonah as myths and not real historical accounts. They also tend to think that either all forms of Christianity are saved in God's eyes, and or they think that all religions are one and there is truth in them all. For some liberals, Jesus is not one and only way to salvation.
John the Baptist comes off a lot like many street preachers today. While I would not take such an approach (unless the Lord personally told me to do so), it was not wrong of John the Baptist to tell people to repent and to call them brood of vipers, etc. (Luke 3:7).