Everytime I conquered a city with conquistadors (+missionaries) the city converted to my Pantheon Belief, not my Religion. I have a large empire with 90% of my cities already converted, so it must be a bug.
After a while, I noticed that many of my cities didn't show any Dominant Religion in their City Details > Religion, although the cities indicate my religion icon on the City UI and a vast mayority of workshippers in the Religion Lens.
Also, I spent four apostles and three missionaries to convert a city and the number of Catholics (that was my religion) only increased by one (and I am the only religion in that city!)
In summary, religion is broken.
I play with all the DLC's.
After a while, I noticed that many of my cities didn't show any Dominant Religion in their City Details > Religion, although the cities indicate my religion icon on the City UI and a vast mayority of workshippers in the Religion Lens.
Also, I spent four apostles and three missionaries to convert a city and the number of Catholics (that was my religion) only increased by one (and I am the only religion in that city!)
In summary, religion is broken.
I play with all the DLC's.