Atheists have self-conceit and pride.
God - be glorified - said in the Quran 67: 20
{إِنِ الْكَافِرُونَ إِلَّا فِي غُرُورٍ}

The explanation:
(Theunbelievers are only in self-deception [with their wealth, their sons and theirlarge number.](

Any qualified man has limited knowledge: he studied some books and made some researches: and whatever man acquired knowledge, this knowledge is only very little.

Whatever knowledge man may have, it is only relatively very little in comparison to the marvels and secrets embedded in the entire universe.

As God said in the Quran 17: 85
{وَمَا أُوتِيتُم مِّن الْعِلْمِ إِلاَّ قَلِيلاً}

The explanation:
(andyou [people] are given only a little knowledge.)

Examples:
Some atheists claim that there are many mistakes in the creation, and they cite for us many examples like the recurrent laryngeal nerve, and say that it goes to the chest then returns back to the larynx; and in girafe it extends downward for considerable distance because of the long neck of the girafe.

I say: You have only little knowledge, and while you don't know the wisdom from creating the recurrent laryngeal nerve, then they come with their defective little knowledge and criticize something they don't know, and on this they base their doctrines and beliefs.

By the way, they worship something like the Totam, which is Nature.

But they are wrong now, as were they wrong in the past when they thought the appendix in the abdomen of man is only accessory and has no function.
While now they became aware about the advantages of the appendix to people.