>>942335112 (OP)
Yes. It is highly probable and logical.
In his Proslogion, Anselm defined God as:
“That than which nothing greater can be conceived.”
Then he reasoned:
Even the fool (the atheist) can conceive of such a being in the mind.
But if the being exists only in the mind and not in reality, then a greater being — one that exists in both mind and reality — could be conceived.
Therefore, the being that truly fits the definition of “that than which nothing greater can be conceived” must exist in reality.
Conclusion: God exists necessarily, not contingently.
Fast-forward to the 20th century: Kurt Gödel (yes, the incompleteness guy) created a formal version of the argument using modal logic (logic of possibility and necessity). His version goes like this (simplified):
It is possible that a maximally great being exists.
A maximally great being would exist in all possible worlds (because “maximal greatness” implies necessary existence).
Therefore, if such existence is possible, it must be necessary.
Therefore, a maximally great being exists.
If it’s possible that God necessarily exists, then God necessarily exists.
Alvin Plantinga refined Gödel’s argument into what’s now called the Modal Ontological Argument.
Logicians like J. Howard Sobel, Graham Oppy, and even Bertrand Russell agreed the argument is logically valid — the reasoning structure is airtight.
Russell famously said:
“It is easier to feel convinced that it must be fallacious than it is to find out precisely where the fallacy lies.”