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inspire me towards the reason why I exist in universe

Answer 1

"I did not create jinn and mankind, except that they should worship Me. I do not seek any provisions from them, nor do I ask that they should feed me. Indeed Allaah is the Provider, the Possessor of Might and Strength." [Qur an 51:56-58]. 

So the soul - if left to its Fitrah (natural disposition and inclination) - would find itself acknowledging Allaah's Divinity, loving Him and worshiping Him alone, without worshipping others along with Him. However, this fitrah becomes corrupted and it deviates away from the pure worship of Allaah, due to what the devils - from amongst mankind and jinn - whisper to some people, beautifying to them their whispers of deception. So Tawheed (to worship Allaah alone) is the core and root of man's fitrah, whereas Shirk (directing any part of worship that belongs only to Allaah, to other than Allaah) is alien to it and is something that deceptively enters into it. Allaah - the Most High - said: 

"So set your face to the Haneef Religion (the Religion of pure Tawheed), This is the fitrah of Allaah which He created mankind upon. There is to be no change in the creation (i.e, Religion) of Allaah. That is the straight and upright Religion. But most of mankind do not have knowledge." [Soorah Room 30:30]."1 

The above Aayah (Verse) clearly refutes the false notion of the atheists; who claim that the natural basis of man is Shirk, and that Tawheed evolved in man! Not only does the previous Aayah refutes this falsehood, but so do the following two authentic narrations: 

Firstly: Allaah's Messenger sallallaahu 'alayhi wa sallam said, that his Lord said: "I created all My Servants upon the true Religion (upon Tawheed, free from Shirk). Then the devils come to them end led them astray from their true Religion. They made unlawful to people that which I had mode lawful for them, and they commended them to associate in worship with Me, that for which I had sent down no authority."4 

Secondly: Allaah's Messenger sallallaahu 'alayhi wa sallam said: "Every child is born upon the Fitrah (i.e. Islaam), but his parents make him a jew or a christian or a magian. It is like the way on animal gives birth to a natural offspring. Have you noticed any born mutilated, before you mutilate them." Abu Hurayrah said: Recite if you wish: "Allaah's fitrah with which He created mankind. There is to be no change to the creation (Religion) of Allaah." [Soorah Room 30:30]."3 

[2]: THE BEGINNING OF IDOL-WORSHIP 
Mankind was, in the beginning, a single Ummah (nation) upon Tawheed, the pure worship of Allaah alone. Then Shirk gradually overcame them. The basis for this belief is what Allaah - the Most High - said: 

"Mankind was one Ummah (nation), then Allaah sent Prophets bringing good news and warnings." [Soorah al-Baqarah 2:213]. 

"Mankind was not except a single Ummah, then they differed." [Soorah Yoonus 12. 19]. 

Ibn 'Abbaas radiallaahu 'anhu said: 
"Between Noah and Aadam there were ten generations, all of them were upon the Sharee'ah (Law) of the truth, then they differed. So Allaah sent Prophets as bringers of good news and as warners."4

So: "During the time of the Prophet Noah 'alayhis-salaam, Shirk appeared amongst his people, and they started worshipping idols along with worshipping Allaah. So Allaah said: 

"Indeed We sent Noah 'alayhis-salaam to his people and he said to them: I have come to you as a clear warner; that you should worship only Allaah." [Soorah Hood 1 1:25-26]."5 

After this clear explanation, it is of the utmost importance for the Muslims to know exactly how Shirk spread amongst the Believers, after they were people upon pure Tawheed? 

[3]: THE ORIGINS OF SHIRK 
Allaah - the Most Perfect - said about the people of Noah: 

"And they said: You shall not forsake your deities / gods, nor shall you forsake Wadd, nor Suwaa', nor Yaghooth, nor Ya'ooq, nor Nasr." [Soorah Nooh 71:23]. 

Ibn 'Abbaas radiallaahu 'anhu relates: 
"These were all idols from Noah's nation, which eventually ended up amongst the Arabs. Wadd was the idol which was worshipped by the Kalb tribe in the region of Dawmatul-Jandal; Suwaa' was for the Hudhayl tribe; Yaghooth by the Ghutayf tribe at Jurf near the region of Sabaa; Ya'ooq for the Hamdaan tribe and Nasr was the idol worshipped by the Dhul-Kalaa of the Himayr tribe. Indeed these five idols were the names of righteous men from the nation of Noah. When they died Shaytaan whispered to their people to make statues of them in honour of them, and to place these statues in their places of gathering as a reminder of them, so they did this. However, none from amongst them worshipped these statues, until when that generation passed away and the purpose of the statues was forgotten, the next generation then began worshipping them.
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