Christians, what is your VERY BEST arguments for the existence of God?

[BioLogos]

Go back and read my post. The parody is included, and I made sure to mention it was a parody. Criticising my post as "not a serious response" is only valid if you thought I was using the parody as some kind of proof of the non-existence of God. I didn't.

The most obvious reason the parody fails is because it uses the same logic as the ontological argument. It seeks to define God out of existence in the same way the ontological argument seeks to define God into existence.

Which ontological argument? It doesn't appear to use the same logic as Plantiga's modal argument.

I never said it was S5 that was the issue, S5 leads to the possibility premise, which is the problem as you said. As I already said, the "proof" doesn't do anything. It just concludes that "either God exists or he doesn't". I could have told you that without coming up with a 6 stage modal proof.

In bold 1: in an argument, nothing leads to a premise...premises are just stated. I presume you have just mistyped here?
In bold 2: the result is stronger, namely that the existence of a maximally excellent being is necessary (if the possibility premise holds) or impossible (if not).