I have a (specific term from my book title) trademarked and the word will be part of my forthcoming book’s title. I recently noticed a church using my trademarked term on a project they’re promoting.

How do I delicately handle this? Do I gently ask them to stop? It’s a church doing really good things but not in the way that I’ve used my book. The name has been officially trademarked and I really want them to stop using it.

You should do some extensive research before approaching that church. They may have been using that term before you. Also, you will need to determine if they are competing with you or not and/or if their use of the term could or could not damage your reputation. Just because you registered the term doesn’t mean nobody else can ever use it. There’s a great article on this topic here:
https://www.iusmentis.com/trademarks/crashcourse/rights/