We didn’t invent the world, we didn’t even name it: what we have now is built on ancient foundations. Good Christian festivals such as Easter and Christmas are found on older pagan festivals: Eastre is the pagan goddess of fertility; the Christ mass was grafted onto Yule, the pagan midwinter festival.
I find it comforting that even the names of days are ancient: today is Tyr’s day. Tomorrow is Woden’s day. Following that, Thor’s day. Then Freya’s day. Then Saturn’s day, then the Sun’s day and then the Moon’s day.