Tenets

 are the practical expressions of a religion. Religion tenets are divided in tiers. A new tenet tier is unlocked everytime the amount of followers of a religion reaches a particular threshold. Once reached, the religious leader of the religion must pick a tenet from the tier that just got unlocked. This choice cannot be canceled afterward and the choosen tenet will be locked for all the other religions. Only the religious leader of a religion can pick any tenet. Each tenet provides one extra holy site building.

Tier 2
Each tier 2 tenets provides a passive bonus of extra.