Atheism is the lack of reason :
Quran 2 :164
Surely in the creation of the heavens and the earth and the alternation (Or: differences) of the night and the day-time, and the ships that run in the sea with whatever profits mankind, and whatever water Allah sends down from the heaven - so therewith He gives life to the earth after its death and disseminates therein all kinds of beast - and the (constant) turning about of the winds, and the clouds subjected between the heaven and the earth, (these) are indeed signs for people who consider.
A man brought a human bone to prophet Muhammad and ask how could God gave life to this decayed bone ?
Allah replied in the Quran :
And he presents for Us an example and forgets his [own] creation. He says, "Who will give life to bones while they are disintegrated?"
Say, "He will give them life who produced them the first time; and He is, of all creation, Knowing."
Is not He who created the heavens and the earth Able to create the likes of them? Yes, [it is so]; and He is the Knowing Creator.
His command is only when He intends a thing that He says to it, "Be," and it is.
وَلَقَدْ خَلَقْنَا الْإِنْسَنَ مِن سُلَلَةٍ مِّن طِينٍ * ثُمَّ جَعَلْنَهُ نُطْفَةً فِى قَرَارٍ مَّكِينٍ * ثُمَّ خَلَقْنَا النُّطْفَةَ عَلَقَةً فَخَلَقْنَا الْعَلَقَةَ مُضْغَةً فَخَلَقْنَا الْمُضْغَةَ عِظَماً فَكَسَوْنَا الْعِظَمَ لَحْماً ثُمَّ أَنشَأْنَهُ خَلْقاً ءَاخَرَ فَتَبَارَكَ اللَّهُ أَحْسَنُ الْخَلِقِينَ
And certainly We created man of an extract of clay. Then We made him a small seed in a firm resting-place. Then We made the seed a clot, then We made the clot a lump of flesh, then We made (in) the lump of flesh bones, then We clothed the bones with flesh, then We caused it to grow into another creation, so blessed be Allah, the best of the creators. (23:11-14)