The practices propagated or persisted for some reason.
For sure organisations find themselves in ruts or local maxima. And things like virtue signalling exist but when practices like prayer, meditation, chanting and singing exist across religions maybe it is worth trying to understand what ordinary people derive from the practices. Whether that be a sense of belonging, presence of mind or the ability to make peace with the cruelty and randomness of life.
It rubs you up the wrong way that I axiomatically assume that all religious practices were useful in general but my point is just like being healthily skeptical about things and challenging the status quo is good. So too, is looking at things you don't understand and starting from the supposition that it is beneficial UNTIL you can prove in your own mind with all certainty that it isn't and then feel free for you to do your own thing.
Are those two approaches in contradiction? Yes that's a good thing, it's healthy to hold opposing views in tension.
If we continually ignore the lessons of the past we are doomed to repeat the same mistakes and relearn the same lessons.
Religion ultimately propagated because people preferred it to what they had before. Sure bad people have manipulated and exploited those tendencies in people but that still happens even without "religion" - see crypto. At least most faiths ostensibly revolve around a set of morals and virtue. The establishment has also been tempered by their own success and and are being forcefully dragged into the 21st century by their need to stay relevant. When I attend my usual annual Midnight Mass CoE service in the UK, the biblical elements are so watered down it's mostly just about being a good person.
Tldr people who are skeptical might benefit from being more charitable just like people who are gullible could benefit from being more skeptical.