"O mankind! Worship your Lord (Allah), Who created you and those who were before you so that you may acquire taqwa (piety).

Who has made the earth a resting place for you, and the sky as a canopy, and sent down water (rain) from the sky and brought forth therewith fruits as a provision for you. Then do not set up rivals unto Allah (in worship) while you know (that He alone has the right to be worshipped."

Qur’an, 2:21-22

Several scholars of Tafsir, like Ar-Razi and others, used this Ayat (verse) as an argument for the existence of the Creator, and it is a most worthy method of argument. Indeed, whoever ponders over the things that exist, the higher and lower creatures, their various shapes, colors, behavior, benefits and ecological roles, then he will realize the ability, wisdom, knowledge, perfection and majesty of the Creator. Once a Bedouin was asked about the evidence to Allah’s existence, he responded: "All praise is due to Allah! The camel’s dung testifies to the existence of the camel, and the track testifies to the fact that someone was walking. A sky that holds the giant stars, a land that has fairways and a sea that has waves, does not all of this testify that the Most Kind, Most Knowledgeable exists?" [Ar-Razi 2:91]

Hence, whoever gazes at the sky in its immensity, its expanse, and the various kinds of planets in it, some of which appear stationary in the sky – whoever gazes at the seas that surround the land from all sides, and the mountains that were placed on the earth to stabilize it, so that whoever lives on land, whatever their shape and color, are able to live and thrive – whoever reads Allah’s statement:

"And among the mountains are streaks white and red, of varying colours and (others) very black. And likewise, men and ad-Dawwabb (moving, living creatures, beasts) and cattle are of various colours. It is only those who have knowledge among His servants that fear Allah." (35:27-28)

Whoever thinks about the running rivers that travel from area to area bringing benefit, whoever ponders over what Allah has created on earth; various animals and plants of different tastes, scents, shapes and colors that are a result of unity between land and water, whoever thinks about all of this then he will realize that these facts testify to the existence of the Creator, His perfect ability, wisdom, mercy, kindness, generosity and His overall compassion for His creation. There is no deity worthy of worship except Allah, nor is there a Lord besides Him, upon Him we rely and to Him we turn in repentance. There are numerous Ayat in the Qur’an on this subject.

Source : www.alislaam.com