Not true. I have no superstitious beliefs at all.
I have beliefs that lack rational support - for example, I prefer to think that the evil of religion is at least counterbalanced by the good. I have no data to support that belief, and can't imagine how you would quantify "good" and "evil" in that context anyway, but I like to believe it is true.
That's not "superstitious" because reliable data could change my opinion at any time.