I believe pressure from your holy city increases if you build the Divine court, might also increase if you build the grand temple (from the city you build it in).
Other than that things that affect religious pressure are:
Faith-purchased buildings: (except the monastery)(some of these are gained from world-wonders)
The Piety opener:
Some enhancer beliefs: Scripture (all cities), Ritual (higher pressure from trade-routes and longer range pressure from all cities)
Some unique buildings: Mission(all cities), Basilica (all cities, and extra from trade-routes)
The Temple building (all cities)
The Indian UA
Probably forgot something, but there you go.
Other than that things that affect religious pressure are:
Faith-purchased buildings: (except the monastery)(some of these are gained from world-wonders)
The Piety opener:
Some enhancer beliefs: Scripture (all cities), Ritual (higher pressure from trade-routes and longer range pressure from all cities)
Some unique buildings: Mission(all cities), Basilica (all cities, and extra from trade-routes)
The Temple building (all cities)
The Indian UA
Probably forgot something, but there you go.