Then you are right, and I am wrong.
Congratulations, this is a hard statement to make. It is very polite when someone has gone to the trouble of engaging you in honest discourse to be willing to concede a point.
But then so is the person who is trying to blame slavery on God completely. ..... I personally feel as though forced slavery is against God's will.
I'm not sure that anyone is trying to blame slavery on God. What they are attempting to show is that Biblical interpretation has changed. The original authors lived in a time when slavery was acceptable. This part of the Bible (not God) may well be condoning slavery however that doesn't mean we have to today.
The point is simply that one can not take every bit of the Bible as the final word even in an areas where it may be particularly strong, that is morality.
In spite of the support for slavery it is very clear from the overall message of Christ and the NT that slavery has to be taken as wrong. It just took a few centuries for socities to grow up enough to be able to get the real message instead of having their noses buried in the individual words.