Like Heaven, we haven't been given all the details of Hell. Just enough to make the existence of both real to us.

In deceiving us, Satan doesn't win his battle against us. He wins his battle against God.

Eden shows us that God made us for Heaven and He made Heaven for us.

Did you know the Bible mentions Heaven in 54 of its 66 books?  That alone should bolster a firm faith in the reality of Heaven.