First of all, nobody here is rejecting Biblical creation. We are rejecting young earth creation. Young earth creation is not Biblical; it is a cartoon caricature of Biblical with a thick layer of science fiction slathered on top of it.
Secondly, nobody here is rejecting young earth creation because it is creation. We are rejecting it because it is blatantly dishonest, because it is hostile to science, because it demands that we reject the evidence of our eyes and ears as its final, most essential command, because it stirs up controversy among Christians about questions that are totally uncontroversial and completely settled everywhere else, and because in its more extreme forms (as here), it says that we must believe in something other than Jesus in order to be saved. We are rejecting it because it is a cult.
I know you will object to being told that it is dishonest, but I’ve said it before and I will say it again: honesty has rules, and if you do not want to be told that you’re being dishonest, you need to stick to the rules. And young earthism does not stick to the rules.