Evolution is a theory derived from evidence. The evidence is not complete so our knowledge is not certain, however on the available evidence evolution is the most persuasive explanation. The theory may have to be changed or refined as further evidence comes to light - that does not undermine the theory, on the contrary it is the essence of the scientific approach.

Scientists have to revise their thinking all the time in the face of new evidence. Some theories, such as the sun going around the earth, have to be entirely discarded. Others may have to be radically revised, such as the Newtonian view of physics after Einstein. This lack of certainty in science is a strength, not a weakness, as it leads us towards a better understanding of how the universe functions, albeit still an incomplete and imperfect one.

It seems to me that what religious people seem to crave is certainty, which science cannot deliver. Faith, by definition, depends on an absence of evidence. Religious beliefs about creation depend not on evidence but acceptance of a narrative which has been passed down the generations.

The difficulty is that different people may sincerely hold entirely different and inconsistent beliefs. One person may believe that the world was created by God in seven days; others may believe that it was created by the union of Earth and Sky, or emerged from chaos, or from an egg. No matter how sincere these beliefs, they cannot all be true, and crucially, there is no evidence to support them. On the contrary, there is evidence to show that they are wrong.

What really worries religions is the concern that if one part of their narrative is undermined, all of it is. The story of Genesis isn't really an important part of the Christian message, and it doesn't really matter what theories some middle-eastern nomads held about the creation of the world 4000 years ago. However if you have insisted that every word of the Bible is literal truth, it's going to cause problems when part of it is shown to be wrong.