The most important mechanic of the Inti religion is the Yanantin, which is a value that can go from -100 to +100. You’ll mostly get penalties if you’re above or below 0, but it gives the most modifiers when it’s exactly and perfectly balanced at 0:

Depending on the gods that you worship, from seven available, you’ll get positive or negative Yanantin:

As you see, the base value is +0.50.

Apart from that, the worship of each of these gods gives passive modifiers to the country: