That is still an opinion.
By every atheist and non-Christian.
Anselm’s concept of “maximally great” being is nonsense.
Also unacceptable. What is the “good” of the eruption of Vesuvius, which covered Pompeii?
So, once again we see the same approach. You act as if your opinion has to be assumed to be true, unless you graciously choose to change your mind, but opinion of anyone else can be dismissed without an argument, just because it is an opinion.
Such implicit demand for a position privileged for no apparent reason is not a path to a fruitful discussion.
Speaking of which, can you explain, what are you trying to achieve in this discussion?
It does not look like you are trying to learn anything new. That would require acknowledging a possibility of some relevant imperfection (not having some competence, some piece of information, having bad judgement).
And if you are trying to enlighten the benighted masses, that, um, does not seem to be happening…
So, what goal are you pursuing here?
If you wish to postulate God with some attributes (over and beyond being a deistic creator), you need to present some arguments for those characteristics. It is unacceptable to declare: “If you do not accept these attributes, you do not talk about the Christian God.” You cannot simply define God into existence.
If you wish to make demands others have to meet, and have them taken seriously, you have to justify them.
Especially when your demand is that other people would justify something to you.
For well, it does not look like we have to. You asserted that you have a proof of something. In such case you have to show that it actually works, that it can take care of all possible alternatives. Even if you do not like those alternatives.
Mere unsupported exclamations “Nonsense!”, “It is unacceptable!”, “Opinion!” would only work if we would know you to be especially competent and honest.
But you are just a random Internet user. You do not have such a great reputation. Hardly anyone does.
Thus all those “Nonsense!”, “It is unacceptable!”, “Opinion!” only look silly, and make your position look silly.
Oh, well. That might be somewhat boring by now, but that is a good enough result for me…