We are in a war/battle, and act as soldiers - gathering karma seems kind of off topic, I think loot or treasure would be more on brand.
furthermore I believe karma to be a non-neutral concept of eastern spirituality to which I as a Christian do not subscribe. In the spirit of fairness and religious neutrality of the site I therefore submit to change the name of the concept.
I don’t think the concept of karma is alien to Christianity, although I don’t know if there’s a term equivalent to karma.
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We have lot of Biblical quotes that describe the essence of karma:
Corinthians 5:9-10
“For we must all appear before the judgment seat of Christ, so that each of us may receive what is due us for the things done while in the body, whether good or bad.”
Mathew 7:12
“So in everything, do unto others what you would have them do to you, for this sums up the Law and the Prophets.”