Justified:
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The term "Liberal Christianity" (or some might refer to it as Progressive Christianity) infers that the past, and beliefs related to it, may be questioned and examined in the light of contemporary research and interpretation. The results of such rigorous researches and interpretations are then available, upon consensual agreement by the examining and questioning parties, to be extended into new avenues of belief concerning what has gone before and its relevance to current conditions.
This should be contrasted with "Conservative Christianity" which, in the main, rigidly and purposefully ties itself to cannonical texts, approved by church hierarchy as "acceptable" in the past; and, such texts, liturgies, and rituals are incorporated into formats which are prepetuated and preserved through orthodoxy and strict hierarchical governance of the institutions which practice them.
One could summarize these definitions by saying that Liberal Christianity, through the methods that it employs to obtain and apply newly discovered knowledge in its practices, strives to move its understandings of the past forward in time: while, the Conservative Christianity approach tends to "freeze" interpretation and understanding of past events central to its beliefs in the past and encourages its participants not to accept or practice new ideas that may be proposed by others concerning the Christian Faith.
This research and application process is essentially what scholars at research institutions do continuously, and this process is used to test the applicability of science and technology all of the time before it is allowed into the public realm. This is the sister process to traditional educational programs that feeds them fresh information for educational purposes as it is verified over time.
This overall process is essentially the engine of progress that has advanced civilization since, at least, the enlightenment, but it was also prominently used in older societies such as classical Greece and within Islam to determine and apply the laws that governed nature at large as it was understood at those times.
And it should also be pointed out that relatively conservative and orthodox religious entities, notably the Roman Catholic Church and The Greek Orthodox Church are actively engaged in the expansion of scientific knowledge and its applications in the world through the educational activities which they support. So there is not so much an issue of "black and white" here, rather a gradation of activities on the right and left sides of the central Christian understandings.
The Jesus Seminar at The Westar Institute is probably the best known of the organizations doing this sort of work in Liberal Christianity at this time. The application of such scientific methods is a controversial technique of approaching new understandings concerning Christian belief regarding the past of the Faith. The Seminar has come under attack quite often from those on the conservative side because of their fear of change in core beliefs that might result from such activities.
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