Do you guys not know how sum works?
Yes, I do, and there is no such thing as a maximally great sum, you can always add one more to any so called maximally great quantity.
What do you get when you sum everything?
Aristotle and about a thousand philosophers since, demonstrate why a maximally great sum can only exist potentially, not actually. A potential infinity is an unending process, in terms of existence in the real world you can never arrive at the actual maximum. An actual infinity, which would be a completed, infinite quantity, cannot exist in reality, and even if it did, we could never know that to be the case.
You get maximal greatness. Also, saying that maximally great idea doesnt exist is impossible, same for maximally great being.
The ontological argument is circular reasoning, which is logically invalid, the premises of the ontological argument are demonstrably false, and the conclusion is not derived logically from the premises. The argument is semantic gamesmanship at best, and it confuses epistemology and ontology, which is not valid,
A finite mind cannot conceive of an actual infinite, which negates the first premise, "greatness" is a subjective term, and it is not established that existence is a quality of greatness, as Immanuel Kant pointed out, "existence" is not a predicate or property, it is a necessary precondition for having properties.
You can't just define something into existence, if you could, you certainly don't need to use the invalid reasoning of the ontological argument, you could simply define God as existing. If you were to define a three-sided square as geometric shape that exists, that doesn't make it exist.