[Lukongsimi]

The almighty Creator communicates with mankind through prophets/messengers and revelations aka holy scriptures.

Your dreams are yours only. That is not God communicating with mankind. When God communicates with mankind, all who believe will get the same message. That is why you see all the religious Jews and Muslims practicing their respective religion in the same fashion because they all have the same message. How did we get that message from God? Through the prophets/messengers bearing revelations like the Tablet or the Quran. The Bible is not from God.

We also know dreams can sometimes be ludicrous or untrue, like dreaming we can fly.

That is the only answer u can give 
Cos you haven’t encounter it 
many moslems already communicated with the saviour Jesus n converted