Sure, let's talk about limits.
How many people were cured of blindness during 1000s of years of superstition?
How many in the last 100 years with science?
Religion has cultural value, but let's not pretend it has epistemic value.
Science is not a thing. It's only a word that means "knowledge". As such knowledfe in baking allows people to bake better bread and cakes. But knowledge alone does just plain nothing.
You're asking why or how miracles, like big obvious miracles seem to be rare. But how would I know?
Now, if there are any such miracle as you mentioned, do you truly believe because it's not in the newspapers or the news on TV, that it never happens?
Because I've been witness of many amazing or terrible events, that would have deserved to be in the news, but were left into the mouth to ear circle of some village, or suburb. For reporters are not here to inform you of all what is going on, but to give you thrilling news, of the kind that allows to sell the surrounding adverts spaces a better price.
Anyhow, I'll insist upon the fact, "science" does nothing, like nothing at all. People do things, with, or without the tools they've got. Among these tools, knowledge, like architectural knowledge for an example, is sure a good tool. But nothing to be worshiped, nor opposed to a religious belief.
Now, I don't see the main point of religion, to perform any specific earthly task, but more like a set of ideas, that is supposed to help us to connect to whoever or whatever would be "above" us, and would have some power to change us, from the petty half animals we are, to some more godly versions of ourselves. That, provided there is anything there.
I agree with the majority of this. A few points I want to make though.
I wouldn't call science knowledge, I'd call it a tool for getting knowledge. Humans are generally bad at gaining knowledge (1000s of years of no progress) and science is a methodology that tries to remove our natural biases as much as possible when we're trying to learn something.
You touch on the idea that knowledge alone is not necessarily admirable (it doesn't do anything). I'll go a bit further and say I think it's unnatural. We want taller buildings, faster airplanes, larger populations... but why? For what purpose? Is a life spent gaining knowledge a life well lived? Does technology make life worth living? I don't think so. (Yes medicine and e.g. plumbing improve quality of life, but going to move on to the next point I want to talk about.)
As for the news reporting miracles, well, it's even simpler than that. For example look at life expectancy and population. 1000 years ago you had every dirty peasant praying for the king and queen every day. Historically did kings and queens live longer, be wiser, have less disease, etc? Of course not. These days everyone walks around with a camcorder in their pocket. There's a reason walking on water and turning water into wine happened 1000s of years ago but never today. (Or always happened to a friend, or in a dream, or etc)
I also disagree a bit about religion. I don't think the purpose is to connect us to something above us. I think that misses the point. Religion, to me, is about how we treat each other, and how we treat ourselves. As pious as it is praying all day, we have to admit that God never talks back. Prayer, or a person's "relationship" with God let's say, is meditative and solitary and has even less practical value than the improvements of next year's phone. A "good" life is defined by how you treat other humans, including how you treat yourself. Religion is at its best when it's used as that type of guidebook. That's how I view religion.
I enjoy reading llama and melvin. This is what discussion should be like.