Hello, could you provide initial file? It is sometimes hard to advice something blank, without knowledge if there some expansionist nearby or agressive civ.
As for guesing:
Im not sure about sacret sites and Tradicion since Sacret sites benefit from many cities (and so does piety in general) while tradicion is better when keep tall. Also postponing tradicion in general is not beneficial.
As for general tips:
Try to pick pantheon which gives faith. Of course as long as it applies to your location, otherwise Fertile Rites or Godness of Love are safe.
With opening there are (at least) 2 aproach:
Tradicion Stonehage, SP: Tradicion + Aristocracy and hard build stonehage choping whatever you can chop, then move to Piety and add Shrine and some Settlers.
Liberty spam: Start Liberty with Collective Rule and fast pump 3 new cities. Then Move to piety and pop shrines and temples, finish Piety, finish Liberty.