Actually there are scholars who suggest there is proof of a deity. I do not agree and never use their arguments but allow they may be right. I will post one, but I do not think it persuasive. I have subjective proof personally by experiencing God and have no need of semantic exercises but non-theists seem to love them so here is one.
1. God is defined by the Bible and philosophy as a Omni-maximal being. The greatest conceivable being. He is non-contingent (necessary) and has all great making properties.
2. The stupid but often used multiverse concept has a potential infinite number of universes. If it is true at all then there is no finite restriction on the number of them.
3. If an infinite number of universes exist then all possibilities exist in at least one universe.
4. That means that every not impossible being or concept is present in at least one.
5. God is not impossible.
6. God must exist in at least one universe.
7. If he exists in one and is an optimal being he must exist in all.
8. God exists in all universes.
The multiverse argument is ridiculous but far from being an argument against God if true it proves God exists. I reject arguments that depend on semantic technicalities used by non-theists so this one is just for fun.
You've presented Alvin Plantinga's modal ontological argument, which even Plantinga rejects. It hinges on modal axiom S5 (that possibly necessarily --> necessarily); but the problem is that the argument assumes the antecedent, so it's actually just circular.
As for "semantic technicalities," this is a puzzling rejection. If you aren't interested in testing definitions for internal and external consistency, then that's simply the same thing as being uninterested in reason.