Whats his fault for being born into a Non Muslim family and rotting in hell due to that?

Question: A man born in a muslim family receives a muslim upbringing and eventually going to jannah becomes a cake. A christian born in  a non muslim family doesn't get the same jannah card privilege. Why is he more likely to rot in hell when god is the one who put him in that household?

Answer: 

No one is going to rot in hell forever merely because he was born in a Non Muslim family. It is a iron-clad rule in Islam that every individual is tested and only then punished upon failing the test. Irrespective of whichever family he is born into, until and unless he doesn't receive the message of Islam properly , is tested (such as by giving  time to research etc.) and fails  - only then he will be punished. If this could not be facilitated in this world, then God will personally facilitate this test for him in the hereafter. 

[Ref: See relevant prophetic traditions in al-Tabaraanee (2/79) with a “Saheeh” Sanad, Musnad Ahmad (16301), Ibn Hibbaan (1827) and graded as “Saheeh” by Shaikh al-Albaanee in al-Saheehah (1434). It was also graded as “Saheeh” by Ibn al-Qayyim in Tareeq al-Hijratain (1/397) and graded as “Saheeh” by Shaikh Muqbil in Saheeh al-Musnad (19)] also the verse “… And We never punish until We have sent a Messenger (to give warning).” [Qur`an al-Israa’ 17:15].]