Do you believe in God? If you believe in God, then you most likely believe in the type of God that is eternal, outside of time, beyond the scope of our everyday understanding. If you believe in this type of God, then you most likely believe that he/she/it created the universe, created earth.
If you don't believe in God, then you believe that the universe itself is eternal, because molecules and gravity and space all had to be around in order for circumstances to occur that allowed for the creation of the earth.
But either way you slice it, you have t0 believe in something that is around forever. Something is eternal. Something is beyond us.
I think that's wild!