Is it wrong for Muslims to believe in wishes?

Answer 1

In one way yes, and in another way no. Allow me to explain:

The first thing one must know is that there is no power in the hands of anyone except God (Allah) to grant anyone's "wish". So if one were to have a wish in their heart and then throw a penny into a well, for example, thinking that the well has the magical ability to grant such a wish, then that person is committing a grave sin. If one were to use a Ouija board, as another example, to contact spirits in order to ask them to grant their wish, then again that would be a delusion, a falsehood and a sin.

But if one were to: 1) Believe in the One God, 2) Live their life in obedience to God, and 3) Ask God to fulfill their "wish", then that is permitted and acceptable.

It is only God who can answer a prayer, and grant a wish.

PS: the "wish" has to be for something good, not evil. Also: God may grant that exact "wish" or He may give you something else (perhaps better).