Probably not what you are looking for, but being non religious and ignorant myself on those topics, I was able to grasp a lot and get to details very quickly through ChatGPT. Things like discussing the disagreements among catholics with the counter-reformation, more nuanced differences between christian denominations, philosophical parallels between western and non-abrahamic, main ethical systems and so on. Since I had noone to talk about these things, and the fact it provides a lot of historical data that I can double check myself, made it very valuable.