The Bible says in the book of Matthew 12:36
But I tell you that men and women will have to give an account on the Day of Judgment for every single careless word they have spoken. For by your words you will be acquitted, and by your words you will be condemned.
Meaning, that if you keep on with your stupidity about God, you will get yours.
Dreams are a revelation of your inner desire. They show you who you really are.
Most people think they are good, that they would never kill anyone. But in a dream where there are no laws or social customs, you can get away with anything. In a dream, these subconscious urges are shown. God shows them to you not to punish or condemn you. Thankfully Mr. Cruise is still alive. No, he wants to show you who are really are so that you can repent - do an inner transformation. Remember Jesus said that if you hate your brother, you've murdered him in your heart. So, please learn from the experience and repent.