What is the fault of children born in a kaafir environment?
Question

                People born and raised in different environments and religions naturally develop different temperaments and identities. A person born in a Hindu family becomes a Hindu upon growing up. For him the Hindu religion is perfect. For such a person it is ingrained into his nature from his childhood that he is a Hindu first and last. Supposingly he receives the message of Islam. What are the chances that he will give up his religion, his identity and accept a new one. Isn't it tough for this person to become Muslim as compared to someone born a Muslim. It scares me to think that if I were born into some other faith than Islam where would I be today. So why is it not the law that everyone does have an equal opportunity to experience and accept Islam from the cradle. It this a matter of Allah's will, Sprituality (Hidayah) or Human Psychology. Please respond with references from Quran and hadith.
Praise be to Allah.Allaah says (interpretation of the meaning): 
“So set you (O Muhammad) your face towards the religion (of pure 
          Islamic Monotheism) Haneef (worship none but Allaah Alone). Allaah’s 
          Fitrah (i.e. Allaah’s Islamic Monotheism) with which He has created 
          mankind. No change let there be in Khalq‑illaah (i.e. the religion 
          of Allaah   Islamic Monotheism), that is the straight religion, 
          but most of men know not” [al-Room 30:30]  
It was narrated from Abu 
          Hurayrah (may Allaah be pleased with him) that the Messenger of Allaah 
           (peace and blessings of Allaah 
          be upon him) said: “Every child is born in a state of fitrah (the natural 
          state of man, i.e., Islam), then his parents make him into a Jew or 
          a Christian or a Magian.” (Agreed upon).   
The correct view is that what is meant by fitrah is the 
          religion of Islam, as stated in the hadeeth narrated by Muslim from 
          the Messenger of Allaah  (peace 
          and blessings of Allaah be upon him), who said: “Allaah said: ‘I created 
          My slaves as haneefs (believers in pure monotheism), then the Shaytaan 
          misled them from their religion; he forbade them what I had permitted 
          to them and commanded them to associate others with Me for which I had 
          not sent down any authority.’” What it means when it is said that a 
          child is born as a Muslim is that he is born inherently ready, when 
          he reaches the age of discretion, if he is given the choice between 
          Islam and its opposite, to prefer Islam over its opposite and to choose 
          Islam as his religion, so long as there is nothing to prevent him from 
          doing so, such as his whims and desires or tribalism. Following his 
          desires makes him prefer falsehood so that he may attain some share 
          of leadership or wealth, and tribalism or racial pride makes him follow 
          his forefathers or elders, even if they are not following true guidance. 
          Allaah says (interpretation of the meaning): 
“Nay! They say: ‘We found 
          our fathers following a certain way and religion, and we guide ourselves 
          by their footsteps’” [al-Zukhruf 43:23] 
And Allaah tells us what the followers among the people of Hell will 
          say (interpretation of the meaning): 
“And they will say: ‘Our Lord! Verily, we obeyed our chiefs and 
          our great ones, and they misled us from the (Right) Way’” [al-Ahzaab 
          33:67]   
If every child 
          is born in a state of fitrah, then obviously there will be some who 
          will be influenced in ways that are in accordance with that fitrah and 
          will strengthen it, such as those who are born to Muslim parents and 
          grow up in a Muslim society. And there will be some whose fitrah is 
          changed, such as those who are born to kaafir parents and group up among 
          the kuffaar, be they Jews, Christians, Magians or mushrikeen. Undoubtedly 
          the one who is born in Islam has means of guidance and happiness which 
          are not available to others who are born and grow up in kaafir societies. 
          Being given easy access to the means of faith and guidance is a blessing 
          from Allaah which He gives to whomsoever He wills. It should also be 
          noted that the person whose fitrah has been changed from Islam will 
          not be punished for the sins of another; rather he will be punished 
          if the call of the Messenger  (peace 
          and blessings of Allaah be upon him) reaches him and he does not accept 
          it out of stubbornness, arrogance or tribalistic pride in the religion 
          of his forefathers and countrymen, because proof is established against 
          him when the call of the Messenger reaches him, and in such a case, 
          if he persists in his kufr then he deserves to be punished. Allaah says 
          (interpretation of the meaning):
“And We never punish until We have sent a Messenger (to give warning)” 
          [al-Israa’ 17:15]   
What you say in your question, 
          “It scares me to think…”, is correct and is wise, for it is the blessing 
          of Allaah upon you that you were born in Islam. If you had been born 
          into another religion, there would have been the fear that you might 
          remain in that false religion, but when Allaah wills good for His slave, 
          He makes it easy for him to have the means of guidance which will bring 
          him from the religion of kufr to the religion of Islam. The entire matter 
          is up to Allaah.  
But when you say in your question, “So why is it not the 
          law that…?” this is a false question caused by unawareness of the wisdom 
          of Allaah and His ways of dealing with His creation. Of course it is 
          impossible for the same opportunities to be available to all, because 
          there are so many different human religions, and guidance to Islam happens 
          when a person chooses to be guided, because Allaah has given man the 
          ability to distinguish between truth and falsehood, between what is 
          beneficial and what is harmful, by means of the reason that He has instilled 
          in him, and the explanations with which He has sent His Messengers. 
          At the same time, the will of the person is subject to the will of Allaah, 
          for He is the One Who sends astray whomsoever He wills by His justice 
          and wisdom, and He guides whomsoever He will by His grace and wisdom.  
          
Allaah says (interpretation of the meaning): 
“Verily, this (the Qur’aan) is no less than a Reminder to (all) 
          the ‘Aalameen (mankind and jinn) 
To whomsoever among you who wills to walk straight. 
And you cannot will unless 
          (it be) that Allaah wills the Lord of the ‘Aalameen (mankind, jinn and 
          all that exists)”[al-Takweer 81:27-29]