The truth we're talking about here is empirical truth, as observed by scientific process.

Hypotheses, theories, reproducible experiments and the many other methodologies are what science uses to discover the truth, not truths in themselves. There are no other truths, apart from those we can observe. What we deduce from these observable truths is a different matter altogether, but science uses methods that have been developed over centuries and are constantly reviewed and updated.

So I can't see a problem with the terminology. If YEC's have a problem with it, it's because they don't understand it, and as can be seen from this thread there is a whole lot of fundamental misunderstanding about science. As for evolution being a belief system, there's another misunderstanding of how science works.