Who says?
As long as there's a working material brain. Where is this brain in a God?
But it's fallible humans attributing these qualities to a God not known to exist. How do you test that these are actual attributes of a God that exists?
So flesh eating bacteria and genetic diseases must have been created by God.
OK, produce the God and show us it has a brain. Then prove it created anything.
What exists in nature can be explained as elements behaving according to the laws of physics.
You're still just assuming a God is behind nature without providing any actual necessity for a divine force.
Logic, math, physics, etc., say so. We have the basic languages of reality. Therefore we have a basis for determining that which can not be readily produced or reproduced.
Man has managed to reverse-engineer the entire universe from one tiny planet within a relatively insignificant time frame -while being unable to actually produce or reproduce its history.
However, those of a mind to do so have generally not been interested in proving the existence of God, as many commonly-held beliefs about God were very quickly shown to be false (young earth and similar ideas).
Add to that the extreme troubles historically associated with religion, and it is understandable that the mere mention of God is unpleasant and wearisome.
Yet... none of that really has anything to do with whether or not a creative intelligence was involved with the initiation of the universe.
Focus has been on that event -and the apparent lack of need of a creative intelligence from that point -rather than what must have preceded it, caused it, etc.
If "In the beginning was simplicity" -that is in no way descriptive of the singularity which became our universe.
We have not focused on how PRE-UNIVERSE simplicity could have become/produced a singularity which essentially packaged all information necessary to cause the universe specifically -and all it would THEN inevitably become absent of creative input.
All possible things are first generally possible -then made specifically possible by continued development -each step making others possible.
The mind of such a creative intelligence can be shown to be necessary by that which has been produced -by determining what was necessary between simplicity an that which was produced -which is indeed indicative of a creative intelligence.
All things point back to that brain just as certainly as all PRESENT physics point back not only to the singularity and big bang, but also to PRE-PHYSICS "PHYSICS" -or those previous things which were transformed into present physics (the atoms are made of things which once were not arranged as such, etc).
Present nature can't produce an Antikythera mechanism specifically -and pre-universe physics could not have produced present physics specifically -without a creative intelligence capable of understanding, modelling, altering reality in memory and then purposefully applying those changes ...is the general idea. Add to that the specific nature of the universe which is indicative of the nature of that intelligence -just as the Antikythera mechanism is indicative of the nature of its creator. The universe has a very specific purpose. It has produced a vast and rich environment by first causing complicated interactive building blocks which produced presently-innumerable worlds within the greater environment -upon which -and from the same interactive building blocks -innumerable and infinitely-varied life forms can develop, adapt, survive, increase in ability and mastery of environment, experience the qualia produced by various arrangements of those building blocks, learn to understand those building blocks to the point of manipulating them to create intended future states of both environment and self.
One can know a brain exists/existed by considering the mechanism in question. That is true even if said brain no longer exists as such -and can not be produced!
A MATERIAL brain is indeed necessary -but such does not require the PRESENT state of matter. In fact, a pre-present-material brain was necessary to produce present material from previous material -based not only on presently-apparent extreme purposeful complexity and specificity, but the fact that specific systems must be in place (processing, modelling, memory, etc) which are able to transform that which naturally develops into that which does not and can not otherwise naturally develop!
PRE-PHYSICS "PHYSICS" / laws would have produced what they naturally did -until they produced the capability of producing the otherwise-impossible -which is by way of a brain produced step-by-step which is then capable of awareness, self-awareness, decision -self-determination. It is a necessary and perfectly natural intermediate stage.
The most basic everything would essentially be the absence of everything -but the presence of that which would and could become everything. Developments necessarily occurred in logical order which made an increasingly more complex environment out of simple states and interactions.
There would be no complex aware self/selves or complex environment of which to be aware -but the basic aspects of both would exist and develop in tandem -eventually producing the processing ability necessary to consider the concepts of self and environment -and increasingly self-determine both.
Our minds are similar. Our minds are a necessary intermediate stage between pre-human nature and human creation -which is indicative of our nature whether we still exist or not.
HOWEVER, we can determine that we and our environment are not completely natural or original -not produced in the absence of creative activity -due to the fact that or selves and our environment were produced in reverse logical order to that which would be expected from simplicity -or in the absence of creative activity.
Our environments and even our selves were prepared for us -before us -and we as individuals had zero input until after awakening in an already-extrememly-capable mind and body.
That is not completely natural development, but mass-production.
We can not be the first examples of intelligence or creativity because we could not exist as we do without being purposefully intended.
I am essentially saying God IS PRE-NATURE NATURE (present nature is pre-nature in a different arrangement which required a brain) -rooted in greatest possible simplicity -having developed that which was necessary each step of the way in order to make things which followed not only generally -but specifically -possible.
Everything which now exists is composed of that which has "always" existed -but in a different arrangement -which required that a brain first exist/be produced.
(Realizations and questions would inevitably logically arise such as... "I" exist [by the development of some sort of arrangement of external and internal self-image/mirrors/self-replication in memory, etc.]. Is there nothing external to me? What is possible from here? What can I become? What can I do? Am I both that which acts and that which is acted upon? If there is nothing possible externally, what is possible internally? I am one. Are there others? If not, can there be others? How?)
(As for God being perfect, that would necessarily be so for continued development.
While it may not seem like many "natural" things would have been created by a "perfect" God, the intent of such should be considered. If the intent of such were to produce other perfect Gods, the first order of business would be to have them understand -or experience if necessary -and overcome imperfection themselves -and so learn to create perfection.)