Yes, this seems to be the next step for theists. It's obvious that the whole concept is nonsensical, so now the guessing and projecting begins.
It’s a mistake to think that if God is perfect He could not create imperfection.
I never said a perfect being COULD not create imperfection. Picasso could scribble, great poets could create doggerel, anyone can operate below their level of capability. Humans are famous for it, in fact. So it's not unusual that they would invent the concept of a perfect creature who creates imperfection for the fun of it. It's just unlikely. Humans cannot conceive of perfection, so they can't imagine how perfection would really operate.
“It’s obvious that the whole concept is nonsensical...”
Obviously not, or so many humans who were more intelligent than you or I would not have spent so much time on the question.
“... so now the guessing and projecting begins.”
Well, I told you I was going to use my reason to make a guess, so pointing out what I just told you wins you no points.
“I never said a perfect being COULD not create imperfection. ... It’s just unlikely.”
Ah. Why should the likelihood matter? We aren’t discussing a roulette wheel or the chance of rain next Wednesday. We’re discussing the potential actions of an intelligent being, and the actions of intelligent beings are not ruled by probability.
I nearly forgot to take issue with this sentence. It's, as the British would say, "utter bollocks". Of course we can conceive of perfection. That's why we have a word for it, and why we have been discussing the concept in several posts now.
What we cannot do is achieve perfection. However, it's clear that we definitely have a universal, inborn (not socially transmitted) concept of perfection. That is why humans everywhere, in all times, and in all cultures, are always striving for this concept of perfection, even though we know we cannot achieve it. That's quite a stunning aspect of human nature that I wager you would find difficult to explain simply by relying on a framework of strict materialism.