Iran has said that it's working on nuclear energy, not a bomb. Their pope-level religious leader said it was haram to have nuclear weapons. I know you can't necessarily trust Iran's word, but can you trust Israel's?

There is ZERO serious questioning that Iran was working on developing nuclear weapons. It is abundantly clear that they were. How actively and to what extent in recent years is a matter of some debate but in general they absolutely have had a serious weapons program.