Same here. Basically, the Religion Game has become a complete non-game to me: Piety, pick Relics from enemy capitals, build 1 - 2 Temples, build 3 - 4 Missionaries, convert enough capitals to get enough Relics, End. The Religion/Relic part of the game is generally over well before Turn 50 of Exploration Age, and everything else about the religion game is Nice To Have (potential extra Gold, Culture, etc) but absolutely not necessary.
This kind of thing is really bad game design, when one of the four Legacy progressions is reduced to a standard single method of achievement. It might as well not be in the game at all.
In fact, it is emblematic of the game's fundamental, basic problem, which is not the oft-discussed Civ transitions or division into three semi-distinctive Ages, but the fact that 'Victory' is based entirely on linear progressions of every type of Legacy in every Age, so that 'victory progressions' of Culture, Economics, Domination, etc each follow the same paths in each Age: conquer X settlements, gather X relics/Great Works, build Z of Y. After a fraction of the games I played in either Civ V or VI, I am already getting bored with the basic Civ VII game play: the only thing left is to play a game with every possible Leader/Civ combination, but I doubt if I'd bother, given how little real difference there is among most of the combinations.
Adding to this sense of in-game Ennui is the lack of agency the game design gives to the gamer. You cannot tear down any structure unless you Overbuild. You cannot interact with any independent City State because there are none - all City States have to be controlled by a Civ to Exist. We have Navigable Rivers, but no way to block them with forts or any other structure: enemy ships can always sail the length of the river unless stopped by opposing Units, and, equally dull, there is no way to extend or connect Navigable Rivers for enhanced movement and trade.
This is typical all through the game: even when bright new things have been added, like Navigable Rivers, they seem to have stopped thinking about them and the mechanics and possibilities associated with them as soon as they had the basics implemented. Once the bright and shiny 'newness' wears off, there is very little left.
It's going to take a lot of DLCs to correct the half-implemented mechanics the game released with. Good luck to them.