The idea that not being able to prove something exists means that it does exist is about as illogical as an argument can get. There is no way to prove god exists either. That's why faith is part of the equation.
If you have faith, good for you. If you don't good for you. You sound like you don't enjoy your belief system being called into question. So why would you question someone else's?
Believe it or not, whether or not god exists just isn't important to some people.