Again this is a major shift from the view of truth held during the time of Christendom. Then the Biblical story was regarded as authoritative - It gave meaning to life and made sense of human existence and history. Not so any more. The prevailing thinking today is that it is impossible to really know the truth. No one can claim to have the truth because everyone makes up their own truth.
Postmodernism rejects the idea of absolute truth and, along with that, objective ethical standards.
No one can tell anyone they are wrong because the truth is as you see it. Furthermore, the whole concept of truth has become irrelevant for many. Here, of course, is another barrier to the presentation of the gospel. I ask these questions to highlight the difficulty, but the answer lies in the questions themselves. Where truth is questioned it is all the more important to give a clear call to Jesus as the Way, the Truth and the Life.