It is the unanimous teachings of the Fathers that the accounts in Genesis are historical accounts and that Catholics must believe that what is written in Genesis (as all historical books) is to be taken as actual events.
It is not, however, the unanimous teaching of the Fathers that the creation accounts are necessarily to be taken literally in accord with current understandings of various terms. The term "day" may not be precisely 24 hour periods of day and night since the sun was not created until the fourth day.
However, the Church has always leaned towards a more literal understanding of the creation account in Genesis but has never declared that to be dogma. One may hold a less literal interpretation and not be an heretic. What is heretical is the Conciliar understanding that the first 11 chapters of Genesis (the history before Abraham) are fables designed to teach moral lessons and not actual history.
Personally, I believe in a more or less literal interpretation of Genesis. This believe has evolved (pardon the pun) over time as I've learned more and more of the actual science behind the "old earth theory" is built upon a great number of assumptions that simply cannot be demonstrated to be true while many assumptions can absolutely be demonstrated to be built on data that doesn't add up.
Evolution is tricky. It's difficult, if not impossible, to prove biological evolution of current species (especially humans), mainly due to the lack of readily identifiable transitional forms.
Evolutionary biology can't even agree on the exact definition of a species, for crying out loud. The entire discipline is a chaotic mess of wildly conflicting theories, ranging from strict Darwinians to the directed panspermia nutjobs (in a nutshell: aliens created life on earth).
That being said, there are certain aspects of "evolution" that are true. Natural selection is a real phenomenon, and can influence the development of a species. What has not been truly demonstrated is that it can cause a species to evolve into a completely different species (i.e. dinosaurs to birds).
Things get even weirder when you start talking about the origin of the Earth, pre-life....
I see no reason to get all hung up on how precise the account of creation in Genesis was. The Bible is not a science textbook. But, it is the Word of God. So one, at a minimum, would have to accept that God created humans, life, earth, the universe, and everything. Whether He did it in precisely six days or not is not relevant.