Pietato
Platonic Perfection
I'm still convinced that getting a religion or building Holy Sites just slows you down. So yeah, if you have faith a Monumentality golden age is great...but you have to balance that on how much you had to delay key builds to develop a faith economy. Monumentality might make up for that by getting cities out more quickly than a regular build can, but I don't particularly like planning my whole game around getting a Golden Age.
No one said anything about getting a religion or building multiple holy sites. You do not go all-in religion, you just use what you have to buy settlers.