Theological experts and Christian church leaders used scripture to support slavery and miscegenation laws.
Actually very rarely, slavery came first and some christians tried to justify it, however the emancipation movement came almost entirely from the church, you didn't need theology to make slavery, economics made that, but theology made emancipation.
I will acknowledge that it is all debatable, but the fact of the matter is the the BiBle means what people want it to mean. How else could we co e to a point where what were previously considered core teachings of the Bible such as the discouragement of the pursuit of wealth and the encouragement of giving everything to the poor have been somehow newly understood to mean the opposite.
It's easy, you just ignore the social-gospel, right wing religious leaders do this ALL THE TIME, I suggest you read my thread on social justice and the bible
http://www.debatepolitics.com/religious-discussions/156925-social-justice.html, you'll notice the responces almost never cite scripture, and when they do it's only individuial advice, or not at all relevant to the subject.
All you need to do is read scripture leaving behind as many presuppositions as you can, of coarse you can twist scripture if you want, but the point is to read it plainly and unbiasedly.
If I chose to read that no authority exists except authority that God has established to mean that the government IS God, then allegiance to country IS allegiance to God.
I don't think that is a particularly good argument, but neither do I think most of the arguments for self saving interpretations of the Bible are good arguments.
You'd have to CHOOSE to read that, and in reading it ignore the rest of scripture, so that wouldn't be reading it as it was intended to be read.
And you're right it's a terrible argument, given what that text is about, paying taxes and obaying the pax Romana ... not allegience, and NO first (or even second) century christian interepereted it thay way, since they refused any nationalistic service, to serve in the legions, to honor the emperor and son.
Show me a poor man who eschews wealth and lives BY the Bible and bears witness by the example of his own life rather ignoring the teachings and telling others how they should live, I'd be inclined to listen, but relative to the people who really get to spread their understanding of scripture, though theological experts they may be, are no more adherent than someone who reads Harry Potter books suggests we should live as they live at Hogwarts.
The Bible in practice is a mirror.
There are plenty of people that do their best to live simply, service the cause of the poor, follow a self sacrificing life, preach the gospel (which was something Christ did and commanded), and live purely.
They just don't have T.V. Shows.