As you think about this, consider what belief will give you to the most yield over the course of the game. Religious Idols might seem the clear winner there, with +1 faith and +1 culture from each gold or silver tile, but desert folklore may surprise you on this map.
Your capital has 3 gold tiles, all of which are likely to be worked most of the game, and 14 desert/floodplains tiles that you are likely to work all game long (including all the floodplains tiles, the riverside and oasis-side hills (farm those) and the gold tiles).
There are also two expo sites with gold nearby. One to the SW along the river has 2 gold hills (I would settle directly on the riverside gold hill--would have done that in your capital as well), and there is plenty of food (flood plains and wheat). That site has 8+ additional desert tiles (not counting those in your capital) that you are likely to work all game long, once you get your pop rolling.
The second expo site to the SE has another gold (also has copper), but NO food, so that's kind of blah. More likely a third city should be planted at the mouth of the river to the NE, for sea trade routes. That site offers no gold or desert, so put it aside for purposes of picking a pantheon.
Summing it up: Once the 5 gold tiles are worked, they will give 5 faith and 5 culture with Religious Idols. The 22 desert tiles (which includes all 5 gold tiles) will give 22 faith with Desert Folklore. Of course, it will take a while to get to 22 pop to work all those tiles, but ....