The title probably sounds like an oxymoron to some. After all, karma is a distinctly eastern-religion term that the Buddhists and Hindus use in reference to reincarnation.
It is not found in the Bible, nor in any of our orthodoxy.
However, in our day-to-day speech, we often hear someone referring to the concept: "What goes around, comes around."
Each and every Christian--in point of fact, everyone--is subject to karmic experiences.
Some people are willing to include "good" things in their karmic outlook. "Good" things come my way because of the "good" I've done.