Quote Originally Posted by Invader
Very much disagree. I think the whole point of Satan was to create this
opposition in viewpoints on the correct way of running things, and against
this highest authority figure. So, when this God creates man, and the most
favored (and rebellious) one steps in and disagrees with the way God is doing
things, he is cast away.
It sounds nice, but if we're following the Biblical story, then that is not how it happened.

I don't usually copy and paste, but there is so much written on the topic, I see no reason to write a whole new one.

Why did Satan fall from heaven? Satan fell because of pride. He desired to be God, not to be a servant of God. Notice the many “I will...” statements in Isaiah 14:12-15. Ezekiel 28:12-15 describes Satan as an exceedingly beautiful angel. Satan was likely the highest of all angels, the most beautiful of all of God's creations, but he was not content in his position. Instead, Satan desired to be God, to essentially “kick God off His throne” and take over the rule of the universe. Satan wanted to be God, and interestingly enough, that is what Satan tempted Adam and Eve with in the Garden of Eden (Genesis 3:1-5). How did Satan fall from heaven? Actually, a fall is not an accurate description. It would be far more accurate to say God cast Satan out of heaven (Isaiah 14:15; Ezekiel 28:16-17). Satan did not fall from heaven; rather, Satan was pushed out of heaven.
Courtesy of gotquestions.org

Quote Originally Posted by Invader
Christians were originally supposed to believe in
one God only before they began to worship Jesus instead, but to say that
Satan is a god as well is polytheistic.
In this context, I mean that he is the leader of the world that rejected God. He is not a god, nor is he the god of Christians.

Quote Originally Posted by Invader
The whole point of this is that this figure, Satan, believes he can prove otherwise.
It's been seven thousand years. He hasn't shown his ability to produce much peace yet, has he?

Quote Originally Posted by Mario92
But he sounds like such a cool guy...
Again, I don't usually copy paste, buuuutttt.....

Characteristics of Satan

1. Created by God, and not equal to God (Prov 16:4)

2. Defies God and despises truth (John 8:44)

3. Was given limited power (Job 1:8-12)

4. Was defeated at Calvary (Eph. 1:20-23)

5. Rules the masses outside God’s protection (Eph. 2:1-3)

6. Commands a hierarchy of demons (Eph. 6:10-12)

7. Came to steal, kill and destroy (John 10:10)

8. Masquerades as "an angel of light." (2 Cor. 11:14-15)

9. Tries to hide the actual truth about our God.

10. Twists the meaning of Scriptures to fit his purposes. (Gen. 3:1-5)

11. Offers counterfeit promises he can't fulfill

12. Always seeks an "opportune time" to tempt us (Luke 4:13)
Courtesy of, crossroads.to

NOT a very "cool" guy.