Georges Ray has defended a position he calls "Meta-Atheism." He believes that just about nobody who says they believe in God actually does, for reasons somewhat like the ones Eliezer mentions. I highly recommend checking it out. Here's a link:
Perhaps it's not worth complaining, but historically "rationalist" was contrasted with "empiricist." Descartes, Leibniz, and Spinoza were rationalists, while Locke and Hume were empiricists. Obviously that's not a contrast you mean to be invoking, though maybe that use of "rationalist" is rare enough that there's no risk of confusion.