The basic idea in Christianity is that something important happened with the life and teachings of Jesus of Nazareth (i.e., that he is in some important sense the Christ).
The next question is: what next?
I.e., Christianity for the last 2,000 years has been an attempt to work out and apply ideas that received a kind of start with the appearance of the Christ in human form, which represented a new link between humans and the divine (and then the on-going, ‘living Christ’ ever since, hence A.D. – or so the idea goes according to Christianity).
Therefore, that the interpretation of certain phenomena within Christianity broadly understood might change over the span of 2,000 years and on as more lines of evidence come in is not a good argument against Christianity, just as changing interpretations of certain phenomena in science as more lines of evidence come in is not a good argument against science.
In both cases we work with various evidence, with new evidence appearing, and we then do our best to put that evidence together – to make the best interpretation of it we can. The commitment is to truth and the good, not to ideology or a given set of ideas, however correct, judicious, warranted, and so on they might seem at a given moment.
So, science is about making the best interpretation of what the truth is with the evidence and tools at hand, and then applying that in ways to make the world better. The same is the case with Christianity.
I think this more general picture is worth bearing in mind when thinking about disputes in Christianity (or science) – a kind of epistemic humility is probably a good idea, as we’re (according to Christianity) in a process, both epistemologically and ontologically (bringing about the ‘Kingdom of God’, i.e., a society of the Good). I.e, we don’t have all the answers, and part of our job is to create a better picture of what the most reasonable position is at a particular time.
Certain ideas become clearer, others are changed, others are largely discarded as being erroneous, there are sometimes dramatic changes in how evidence is brought together, other times incremental changes, and so on. This is because new evidence may be (and often is) brought into the picture.
Indeed, these changes are probably instrumental in bringing about the ‘Kingdom of the Good’, from a Christian perspective. The basic Christian stance is that we are going somewhere, i.e., a useful basic stance is one of epistemic adventure.