[dr_lew]

In simpler terms, God just snapped his finger and billions of years of creation began.

Once again, executive fiat, just as God commanded the earth to bring forth grass.

[MosesKnows]

God commanded the earth to bring forth grass

Exactly, but before God could bring forth grass he first arranged the creation of soil, water, and sun. It is best not to allow yourself to get too carried away simplifying the concepts.