Is slavery evil? Is there a God-given right not to be a slave? Is the right inherent in being human, or is it the result of being born at the right place or the right time?
Yes.
Is there a God-given right not to be a slave?
Yes
Is the right inherent in being human,
Junior and I were discussing the word "inherent" a little while ago. My view is that rights are not inherent but endowed.
or is it the result of being born at the right place or the right time?
I would say that the right to be free was endowed at creation. So, why did the Constitution allow for slavery?