This question raises some issues that can best be addressed by more closely relating individual parts of the question with the assumptions that lead to the question part:
Since man was created in the image of God, which I consider to be that God created
man with those traits, common to God himself...
If we being made in God's image have such pride as to believe that we are the pinnacle
of intelligence are we not proclaiming ourselves at least equal to God.
Creation.com does indeed make just this claim, whether or not we consider it egotistical:
The Bible indicates, therefore, that man is a unique, spiritual being, the pinnacle of creation.
Apart from Genesis 1:27, there are no grounds for the belief that man is the pinnacle of creation, which is therefore apparently egotistical.
No one can deny that the people who support creation.com believe in God, but the question goes on to wrong-foot, on exactly the same grounds, those who do not believe in the existence of God:
Since man was created in the image of God... In that light I find it difficult to
accept that man is so egotistical as to deny an intelligence and power superior to himself.
It almost seems that if we deny the existence of God, we are proclaiming man is God
or the most superior of all.
In dissecting the logic put forward by this question, it appears that man is egotistical whether he believes in the existence of God or does not believe. It need only be pointed out that those who do not believe in God, whether they believe in other gods or none at all, are by definition not proclaiming that man is God.
Did God create man with this egomania intentionally or was this part of the Knowledge
of good and evil, which came from man's disobedience in the Garden of Eden?
If God made man in his own image (Genesis 1:27) then we can not say God created man with this egomania intentionally. We can not say that this is part of the Knowledge of good and evil, which came from man's disobedience in the Garden of Eden, if the Bible tells us that Adam and Eve learnt a painful lesson because of their disobedience. It seems from the assumptions put forward in this question that man is predisposed to be egotistical, and that is reflected in both belief and non-belief.
The question also raises a somewhat unrelated issue of evolution, arguing ad absurdum:
The reasoning I use to make that Statement stems from the popularity of the theory
of evolution, the lengths to which society will go in order to legitimize it.
Every time some different fossil is found there seems to be a concerted effort to
somehow garner it as proof of Evolution. All the while ignoring that even in our
lifetime some species have become extinct for Environmental reasons. And will some
future generation (assuming there will be one) find fossil remains from some
extinct species such as the dodo bird and proclaim it as proof of evolution.
The question does not stop to consider that the Theory of Evolution is popular because it is the best explanation for the observed facts. The extinction of the dodo does not, and can not, prove that evolution has occurred. Pope Francis, who is is not known as egotistical and is certainly a believer in the existence of God, in a speech given at a Pontifical Academy of Sciences, has declared his support of evolution as the scientific explanation of the origin of man.