There aren't many religions just because of the devil alone. Religions were built down the line through the descendents of Abraham, and were brought forth by the sin of Man. Genesis 17:5
No longer will you be called Abram ; your name will be Abraham, for I have made you a father of many nations. God didn't say all these nations would be of Him, he simply said I will make you the Father of them, and because Abraham being the Father of these nations and being a man they were in sin until Jesus Christ could come to die on the cross for them.
It simply started when Sarah was unable to have a child, and she went out of the will of God giving Abraham to her maidservant who then gave birth to Ishmael which the Muslim nation was built from because of Abraham and Sarah's unbelief. God then gave them Issac which the Jewish nation developed from. Issac therefore had Esua and Jacob who were already two nations fighting in there mother's womb. Esua disobedied God and went over to marry into the muslim nation and therefore became a muslim. Judaism was developed from Moses teachings and laws. Christianity came from the son of God. Ordothdox-Christians were the Pharisees and Sadducees who operated under the laws of Moses. They didn't believe anybody could preach the gospels. They were known as "generation of vipers." They were noted for their self-righteousness and their pride (Matt. 9:11; Luke 7:39; 18:11, 12). They were frequently rebuked by our Lord (Matt. 12:39; 16:1-4). Each religion based itself from God, and the fight against the Holy Lands.