"Unclean"

Do you believe in the seven literal days of creation? I believe God created clean and unclean from the very beginning. Everything was very good and had its purpose, though sin had not yet entered in. He still had created some animals with a cloven hoof and some without;some that chew the cud and some that did not. If I only had the book of Genesis,I would still know that there are clean and unclean animals (Gen. 7:2-3). God simply reminds the Israelites of the specifications in Lev.11; just as He reminds them of the Sabbath (Exo.16). I also think that Christ reconfirmed His thoughts on the matter, by sending the demons into a herd of pigs. In the other situations He sent the demons back where they came from.