Is it wrong for a Muslim to say that no Hindus will go to Jannah?

Many Muslim preachers say that Hindus will not enter Jannah because they are idol worshipers. But why would they say something like that? Who goes to Jannah and who goes to Jahannam is Allah's choice. Allah might be merciful towards particular Hindu individuals and allow them to enter Jannah. We can never know who will enter Jannah. It all depends on what Allah wants. We don't know the future. Only Allah does. Is it wrong for a Muslim to say that no Hindus will go to Jannah?