What are some examples of religious superstitious beliefs?

That god even exists. There is no evidence to support this assumption.

That Hell exists. Prior to Christianity, the Jewish god did not punish people in the supposed afterlife. This heresy began with some factions of the early church.

That god is all-knowing and all-powerful. The Israelites didn't think their tribal diety was. Judges 1:19 King James Version clearly states that god COULDN'T deliver victory in battle to the Jews because their enemies "had chariots of iron".