The difference is that the universe can be measured and the results can be shown to you. God can't be measured. I think most people simplify this argument, it's not that you have to positively prove something to an individual. You have to show that something is capable of existing. Anything that exists can be measured in some way, whether that is light spectrum or electronic weight. Since most Theists agree that there is no way to measure God I think they would be better off just admitting that they believe in his existence on faith rather than even bother with the evidence.
It's really an oversimplification of the argument although I don't blame you, since most people using it over simplify it as well.
It's really an oversimplification of the argument although I don't blame you, since most people using it over simplify it as well.