Thoughtful people can't deny the existence of God

Since the beginning of the industrial revolution, industrialists and scientists have fantasized about a symbiotic factory setup. Consider two hypothetical factories A & B. Suppose the two factories could be arranged such that the waste product of factory A would serve as a raw material for factory B and the waste product of factory B would serve as a raw material for factory A. Then the factory setup would able to run perpetually with zero expenditure and unlimited profit! However this has always been nothing more than a fantasy. The raw materials in every factory are quite expensive to obtain and the waste products are quite useless and expensive to even dispose off.

Amazingly enough, such a symbiotic factory setup already exists in nature: human respiration & plant photosynthesis. At every moment we human beings breathe in O2 & give out CO2.

O2 is life-sustaining & CO2 is life-destroying, if present in excessive quantity. Therefore the human respiration by itself would diminish the supply of O2 & increase CO2 in the atmosphere soon making the atmosphere & the planet inhabitable for human beings and indeed all O2-breathing creatures.

But there is a magnificent balance system in nature which exactly takes in the waste product of the human respiration CO2 & gives out the raw material for respiration O2 - plant photosynthesis.

Isn’t it remarkable that what the best scientists on the planet could nothing more dream about has already realized by nature? Albert Einstein has remarked, "There are two ways to live life. One is to see nothing as a miracle & other is to see everything as a miracle."

Some people say that nature certainly works remarkably, but its working is automatic & more or less governed by chance. They argue that seeing any divinity or God controlling nature is just a sentimental longing coming from an unscientific mentality.

However the word ‘automatically’ used in this context is somewhat misleading because it doesn’t indicate the absence of a controller, but rather the absence of the knowledge of the controller.

When we say that a machine works automatically, what it means is that the machine doesn’t require continuous interaction with the operator. But still there is an operator who activates the machine and monitors its working. Is that the case with nature?

E.g. If you want to have fun with a child, then you might get an automatic toy i.e. either a mechanically or in some other way programmed toy. By staying out of view of the child, you release the toy & it comes moving into the view of the child.

Seeing the toy moving automatically, the child becomes astounded and thinks that the toy is working by itself. But you a wise person will never be misled into the conclusion of an inexperienced child. You know that even if the toy is moving automatically, it is programmed by you.

Similarly the magnificent phenomena in nature are not just occurring automatically; they are working under the expert but remote and therefore invisible programming of God.

Uninformed people, like the naive child, may think that nature is working automatically, but wise people throughout history – religious and scientific – have always understood that there is a super-intelligent designer behind nature. Thus it is that the famous physicist Lord Kelvin has remarked, "If you think deeply enough you will be forced by science to believe in God."
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This material nature is working under My direction, O son of Kunti, and it is producing all moving and unmoving beings. By its rule this manifestation is created and annihilated again and again ~ Lord Krsna [Bg 9.10]

My Spiritual Friend Subramanian R wants to add few more points

God's ways are inscrutable.How does the tough coconut consist inside the delicious coconut water? Who kept a hundred seeds inside the pomegranade? Who taught the new born baby to look for its mother's breast for food? If you think of these things, you will realize that there is a great designer for all these. But no one can find the source code for these designs.

Sri Bhagavan says in Sri Arunachala Akshara Mana Maalai, Verse 80:

Mudi adi kaaNa mudi viduthu anai ner
Mudi vida kadanilai arunachala!

[anai = Annai, Mother.]

Our ego is a knot for which there is no beginning and no end.

You have undone the knot which shows no beginning and no end.
And now should yo not like a mother complete the task, O Arunachala!