Satan is not sin. Satan is a fallen angel who chose to turn away from God. When God created the angels, he created them good and gave them the free will to choose to love him or turn away from him. Because of their purely spiritual natures and their greater intellect, the choice of the angels was one irrevocable choice for God or for self. The fallen angels chose self. While God loves every being he has created, he will not force his love on anyone and will allow them to choose against him.