Modal ontological argument

[Angrboda]

Suppose that it is possible that there never was anything, that nothing ever existed.  Is this possible?  Of course.  If that's the case then it's trivial to produce a modal ontological disproof of God.

1. There exists a possible world in which nothing exists;
2. If nothing exists in some possible world then a maximally excellent being does not exist in that world;
3. If a maximally excellent being does not exist in some possible world, then it does not exist in all possible worlds;
4. Therefore, a maximally excellent being does not exist in this world.

Your argument is invalid because premise 1 is false. A world that simultaneously exists and doesn't exist is an impossible world. (P and non-P) is never true, 

That's not how possible world semantics works. And it's trivially easy to reformulate the same argument without the possible world semantics, so you're doubly wrong besides being ninja'd.

Asked and answered.