Are religious people just superstitious but won't admit it?

Well superstitious is what you call supernatural beliefs that you think are false. Very few people with supernatural beliefs think they are superstitious themselves whilst thinking that people with different ones are. The exception is people like me who know they have a tendency to magical thinking but recognise it as irrational and do everything they can to overcome it. I feel a chill when someone says something 'blasphemous' against Christ - this is my superstition - I tell myself not to be ridiculous. Religious people will not admit they are superstitious because it is tantamount to saying they know they believe things irrationally.

Superstition is about luck - I can think of nothing important in religious belief that rests on the notion of luck.

On average, yes.

Why would you want them to admit that?

It is more popular in uneducated countries i wonder why .

Some are, some are not.