Why is the devil named Satan?

Answer 1

."Satan" means "Resister," or opposer. The word "devil" means "slanderer" and thus refers to someone who tells malicious lies about others Actually they are belonging to one powerful spirit creature. Both The Bible and world events show that he is a real person and Satan is diametrically opposed to God. God did not create a wicked creature in opposition to himself. Rather, one of the angelic "sons of God" developed a selfish desire to seize for himself the worship rightfully belonging to The Almighty God . (Job 38:7; James 1:14, 15) This desire led him to embark on a course of rebellion against God. The Bible explains the process of self-corruption this way: "Each one is tried by being drawn out and enticed by his own desire. Then the desire, when it has become fertile, gives birth to sin; in turn, sin, when it has been accomplished, brings forth death."—James 1:14, 15. This is apparently what happened.
By rebelling, this spirit creature made himself Satan(meaning "resister") and Devil (meaning "slanderer"). How?...you might ask! The answer to that question relates to events in the garden of Eden, where this once perfect, righteous spirit creature , who made himself Satan (resister) and Devil (slanderer) began his career as world ruler. There this angelic spirit creature suggested that God was ruling in a bad way by withholding something good from the first man and woman, Adam and Eve. According to this angelic spirit creature if they ate the fruit forbidden by God, they would be liberated. Adam and Eve would be free and independent of God.
They would be like God himself!—Genesis 2:16, 17; 3:1-5. By lying in this way and seducing Eve and through her inducing Adam to break God’s law, this once angelic spirit creature now made himself Satan, brought the first human pair under his leadership and control. The Devil thus became their god, one in opposition to God Almighty. Instead of liberation, however, Adam and Eve experienced slavery to Satan, to sin, and to death.—Romans 6:16; Hebrews 2:14, 15. Therefore Satan (resister) resisted God's sovereignty . Only after he willingly took a course of opposition and resistance to God was he called Satan. He also being called "Devil" is due to him slandering God's name..of which he told the first recorded "LIE" in the bible at Genesis 3:4.

Answer 2

Satan entered post-Exilic Judaism as the 'adversary' but under the instructions of God, tasked to test the righteousness of the faithful. Jews continue to see Satan as the loyal assistant of God, doing his work.

It is in Christianity that Satan evolved to become the devil, seeking to cause the faithful to deviate from righteousness and to destroy God's kingdom. Satan continued to evolve throughout much of the Middle Ages, at time as a figure of fun and sometimes with changes in how he exerts his wicked powers. He is now an essential part of Christian belief, but if you did not read about Satan in books you believe to be true you would have no reason to think that he exists. After all, why should we believe a being exists if we can not even decide whether he helps God or opposes him?

Answer 3

Christianity made the devil.

Answer 4

To personify the opposers of the Church.