God created everything, and keeps everything in order. He is the infinite antecedent to all that has happened. The Big Bang was His distinguishing between matter and void. When creating the first sentient beings, He made known to them what was pleasing unto Him (moral), as well as the consequences that will follow their actions, while also giving them free will. He created them not out of sheer boredom, but out of love, that His creations may enjoy happiness in His midst.
One of His angels, whose name was Lucifer, which means "bearer of light", was the most intelligent, beautiful, and powerful in His fleet. However, he had the desire to overcome God and ascend to His throne. God, upon creating the angels, gave them a choice: Stay with Him and serve Him, or leave His presence to serve themselves.
Lucifer, amongst many other angels, chose to serve themselves. God is a Being of Love and Creation, and anything outside of Him is of hatred and destruction. And so, Lucifer and the other angels banished themselves to hell, the polar opposite of the place of happiness God promised to His angels at their creation.
God eventually created humanity, whom He also promised happiness, should they obey His simple command to not eat of the forbidden fruit. At this point, humanity, was bestowed rulership over the animal kingdom, just as much as the angels were given purposes of their own, which are, but not limited to protecting the planets and stars, singing God's praises forever, protecting humanity, etc.
However, humanity was oblivious to iniquity. Eating the forbidden fruit would provide humanity the distinguishment between good and evil, something that God did not intend humanity to know about. One day, satan, Hebrew for "the enemy", the former bearer of light, came to the first two members of humanity, Adam and Eve, and convinced them to eat the forbidden fruit.
God was displeased with Adam and Eve's disobedience, but gave them a second chance for a few reasons: 1. They were oblivious to the effects of sin (evil). 2. They didn't desire to overcome Him, but merely become as powerful as Him. 3. Now that they realized the difference between good and evil, they could make the decision to recommit to God or continue to stray from him in their disobedience.