Since you put this out on an open forum, I'll briefly counter. As there is strong evidence for a young earth.
However, extreme cultist creationism does have such a requirement.
Christianity on a cultist level is like any other cult. It's certainly not even based on true Christianity, but rather the beliefs of some hyper controlling nut job looking for a device to control people with.
Theology examines the words and context of the Christian bible and for Jews the Tanakh. "And there was evening, and there was morning— the fourth day." its determined to be a literal day cycle. A belief in a 6 day creation is not required by the Christian faith for one to be a Christian. I doubt you could name one cult that does.
Secondly there is much evidence that casts shadow on evolution. Such as how is it that there has been found cellular tissue of dinosaurs un fossilized that are supposed to millions of years old, or that isotope dating requires an observer or how else can the chemical levels be measured accurately if the starting levels are not known, or has the chemical level rates of decay constant. There is much debate. Evolution or age creation grew out of the decades before Darwin and much more after Darwin.