I will be challenging you in this argument, good luck. How does it make any sense? There is more than one possibility that the universe exists, so are you saying the universe doesn't exist. There is more than one possible way to solve a math problem, so it isn't real. Most of the time there is more than one option.
Go tell Albert Einstein that possibilities are non sense. There is a possibility that ISIS could bomb something, that isn't non sense. There was a possibility that there are gravitational waves, and we just proved that is exists.
It is possible that they will soon. You still aren't bring up any good points on why you are correct. If something is a possibility, that certainly doesn't mean that is does exist. Go look at scientific discoveries, those are all based on possibilities, so you are saying those don't exist?