Does Existence Belong to the Concept of God?

Here's another question from 20 faces. He says, does this argument not rest on the idea that existence belongs to the concept of god? Amona put up the the argument back up on the screen for everyonelet so one one more time. I'll just read it aloud for everyone. Let me say this, necessary perfection, or perfection in all possible worlds, which i think will entail necessary existence. But these things don't have to be built into the concept ofgod,. technicallyi if i could just kind of spell out what i actually think about it is, i think there is a sort of more basic concept of supreme greatness or perfection.