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

[Tiberius]

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

*You* brought up Plantiga's ontological argument, after you called my response "not serious". How could I have been talking about Plantiga's model? I was talking about the general ontological argument, and the counter-argument is the parody to point out how you can "prove" anything using the same faulty logic. I'm not going over this again...

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).

Yes, I mistyped. S5 is used *from* the possibility premise, my bad. The problem is that if something possibly exists, it does not infer that it necessarily exists. You could define anything into existence this way, as long as what you are bringing into existence isn't logically impossible.