JackOfClubs
Warlord
This has been my experience as well. I think the spiritual civs are more aggressive in spreading a relgion they have founded, but I have even seen Qin sending scores of Buddhist missionaries across my borders. It makes sense from a financial perspective to get as many cities contributing the tithe to your holy city so that must be a factor in the AI's algorithm as well.They are more aggressive in spreading their religion on higher levels and also only the founder of an religion will bother to come after you with missionaries- But even on Prince - if you have peaceful relations with a religion founder AND not have too many religions in your cities they will eventually send missionaries and ask you to convert lateron. I think they don't bother if you already have more than 3 or so religions in most cities, but I do not know that for sure...