What if Creationists were Athiest for a day?

[Anomalocaris]

Evolution, big bang, natural selection etc aren't atheistic.

Not atheistic per se, but naturalistic - as scientific principles, they are based on the assumption that no god directly interferes with them. That's already asking to much for some of the religious.

They are not based on the a priori assumption that no god interfered with them. They simply conclud that based on present understanding God is neither a productive nor a parsimonious hypothesis for what had affected those processes.