Singling out those verses and claiming Christ supported slavery is a gross misinterpretation. Healing a servant and recognizing the existence of a relationship between a Master and a servant is not exactly unqualified support of slavery.
BTW, before you go there, being a servant of Christ is something that one does willingly. No one is forced into servitude of Christ.
I suggest you check your translations. The original non-PC translation was “slave”, not “servant” in many Bible verses. However, that’s not the case for all uses or verses and I will cheerfully agree that nobody is forced to worship Christ in the US per se.
My point is that if you want to play the WWJD/WWJS game, be prepared to have Bible quotes that undermine your position thrown back at you. And that criticizing a work (or supporting one) without having read and fully understood it is STUPID.