You’re falling prey to a common trope from religionists: an ambiguous usage of the word/concept “belief.”
I trust what experts in fields outside those I’m deeply familiar with because generally speaking people like them have gone to the trouble of demonstrating what they claim is actually true in the past. That makes it rational, in my opinion, to trust claims that they make today and in the future within their field of expertise.
So to some extent I get the religious commitment of people who have directly experienced what they consider to be miracles. It’s rational, in a way, to become religious after experiencing what you consider to be a miracle.
The vast majority of religious people have not directly experienced a miracle the way I’ve directly performed scientific experiments that validate others’ reported results. They’ve heard about miracles. They’ve read about miracles. That’s not the same, and I’d argue it makes their religious beliefs irrational.
Now, what would probably happen if people were only religious after directly experiencing miracles? I bet religions would just fade away and eventually people who experienced “miracles” would instead contemplate then as unexplained phenomena that could probably have AB explanation rooted in the physical world, and also but become religious.
In a world where religion is encouraged and celebrated, of course people who experience what they consider to be a miracle will first turn to a religious explanation. But if we imagine no religion…