cofty says...
"There is not a single word in the NT that directly opposes slavery."...
BUT, even if there were, the authenticity will be called into question by you.
So, you're making your argument based on the silence of the written texts when evidence concludes that the gospel and teaching of Jesus was first of all oral?
The fact is, early followers of Jesus were known as good people who bucked at the prevailing attitudes and values of the establishment, both roman and jewish. "primus inter pares" being the norm.
OT typeology: "Leviticus 25:13 “In the year of this jubilee ye shall return every man unto his possession.” (17) “Ye shall not therefore oppress one another; but thou shalt fear thy God: for I am the LORD your God.”
The object of the year of Jubilee was liberty and to break all oppression. The Jubilee was a type or forerunner of what it would be under the reign of King Messiah. The Jubilee was to set the stage for the coming of King Messiah as His reign would be one continual Jubilee. All oppression would end under His rule. Justice and truth would reign."