You make a good point. I think a good example is "abiogenesis". They say it is not important, but they do need show how evolution started.
The vast majority of those that accept the theory of evolution, including the pope, don't believe in abiogenesis. Abiogenesis may or may not have happened. The difference between science and religious dogma is that science has no problem admitting where the data is lacking and adapting to better data or a more complete explanation. We have a powerful theory of how life evolves, complete with massive fossil evidence showing transitions, DNA showing gradual change, ERV insertions proving common descent, etc. etc.
We have no hard evidence for abiogenesis. We have hypotheses and some lab experiments showing some possibilities, but it is nowhere near the level of a scientific theory, and so what? It is possible that we will never be able to prove abiogenesis, and so what? Are creationists bringing a theory to the table? Even a better hypothesis? No. There is no evidence for creation. Creation is not a better model. If evolution were a religion, than scientists would take the religionists' shortcut, and say that the first organisms were always in existence, as creationists claim for god. Evidence be damned. But they don't. They say we don't know, because we don't. And neither do you.