The Slavery of Religion

Nietzsche believed that religion was a form of slavery. If you look at the way religion is set up it does look like a typical plantation slave structure. In religion there is god, a church where he is served, a group of priests ministers or preachers who are supposedly to serve their god, and the people who attend the church. There are more people who attend the church than who officiate at them. Now lets look at the plantation slave structure. You have a master of the house, the manor in which he lives in, the house servants who serve the master and his family and live in the manor house, and finally the field laborers. There are more field laborers than are house servants, proportionally. Now compare the two and you will see that basically religion and slavery are the same structurally. No wonder that Jesus and Paul used so much slave imagery when they talked about men’s relationship between themselves and their god. And by the way they never seem to decry the institution itself anywhere in the bible.
The Old and New Testament are on the whole a pro slavery book. No wonder Jesus, his disciples, or Paul never spoke out against it. And even advocating aspects of slavery. Today we believe that slavery was and is an immoral system worthy of abhorrence. But the god of the Bible was okay with it. What does this say about this god and his book and his people follow it slavishly?