To build upon DJ's comment here, Christ in the 1st century, was an anti-type of of Caesar, one of whose titles (given by his Roman subjects) declared him to be the "Son of God". Earthly rulers (like the one known to the Mediterranean World) were corrupt, unjust, unloving. Society was based on the powerful oppressing the weak in an established pecking order, including those at the top (Lord/Master) and those at the bottom (slave). Christ was the one who would throw this all out and...
- make a community of equals before God. "There is no longer Jew or Greek, there is no longer slave or free, there is no longer male and female; for all of you are one in Christ Jesus." (Galatians)
- based on love toward others, in and out of the community, "And may the Lord make you increase and abound in love for one another and for all, just as we abound in love for you." (I Thessalonians)
- where we would all be counted as peers with Jesus, who would be the "firstborn of a large family." (Romans)
- where we would be counted as the children of a benevolent, not enslaving Father, "For all who are led by the Spirit of God are children of God. For you did not receive a spirit of slavery to fall back into fear, but you have received a spirit of adoption. When we cry, “Abba! Father!” it is that very Spirit bearing witness with our spirit that we are children of God" (Romans)
- and as children we inherit what He has as equals with Jesus, "And if children, then heirs, heirs of God and joint heirs with Christ" (Romans)