That is not the case. Observing something for which one can provide no natural explanation is going to cause a rationalist to increase their probability estimate for the supernatural. It's not going to increase it to near certainty, because the mysteriousness of the universe is a fact about the limits of our own understanding, not about the universe, so it's still possible that something we can't explain has natural causes we don't yet have the ability to measure or explain. But it will cause the estimate to rise. And if inexplicable things keep happening, their estimate will keep rising.
The question, though, is whether there is anything that could ever cause you to lower your estimate of the probability that your religion is correct. If the answer is no, then you're not being rational right off the bat, and your quest is doomed.
The only way to subscribe to both rationality and theistic religion is compartmentalization
What do you mean by compartmentalization, then, if it's not a bad thing? Sounds to me like it's sacrificing internal consistency.
The question, though, is whether there is anything that could ever cause you to lower your estimate of the probability that your religion is correct. If the answer is no, then you're not being rational right off the bat, and your quest is doomed.
That's true. I actively go looking for things that might challenge my faith, and come out stronger because of it. That's partly why I'm here.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.