As a writer, and a dedicated Christian, I have had three overtly Christian books published and one republished by two publishers which is still in print. I would really love to have an agent to do all the negotiating and initial 'business' side of getting published. Most agents ask for non-religious manuscripts. So do you know of anyone who handles these things? (I mainly write biographies and fiction.)
Agents don't always state what specialties they might be interested in as it could end up being a long list so it's worth, first, researching agents and finding one or more you think you might like to work with, and then sending an enquiry (or calling, if they give a contact number). You're a published author, so tell them that up front - it doesn't matter what 'genre' you write in. The agent-writer relationship is fundamentally a personal one - you have to like each other - so if you find someone you like and who likes you, I doubt that they'll worry too much about what your writing specialty is.