To answer the title, I think Christians should use AI as little as possible. More like a research tool or generating templates. The reason is that the Holy Spirit works through God’s Word (or truth), His people, and Christ-like character with human connections. AI can only deliver one.

Also, Christians always face persecution which includes people trying to censor or attack them. A common method, which I’ve experienced, is misrepresenting their words or actions. Paul kept saying they were blameless among them, just told the truth, and didn’t use worldly tricks. Our integrity, including not using fake things, is both a defense and a positive example in an increasingly, fake world.

Far as training them, here’s a few sites with material that might help:

https://www.biblicaltraining.org/

https://www.gotquestions.org/

https://apologeticspress.org/

https://answersingenesis.org/

I’m not endorsing everything on the sites. They just each have good things on specific topics.