The only nanotech concerns I see would be the replacement of human body parts or bodily systems with mechanical parts. If God made the body good, cutting it up just so you can add a computer interface isn't "playing God." It's an advanced form of body mutilation, a defacement of His creation.
If the procedures are much more invasive than, say, an ear piercing, they would trigger some reactions, and rightly so.
Very good point. It is a bit hypocritical.
I’m all for nanotech as long is it’s not Borg drone hive-mind stuff. Then I have a problem.