We all know how... 'misunderstanding' the bible can be, more than 80% of the time, through its stories and scriptures. Theres one specific that disproved the existence of Heaven 100%, for me of course. Thats the Verse from Luke 17:20-21, it goes something like this:
20Once, having been asked by the Pharisees when the kingdom of God would come, Jesus replied, "The kingdom of God does not come with your careful observation, 21nor will people say, 'Here it is,' or 'There it is,' because the kingdom of God is within[a] you."
The most catching of this whole verse is of course "The kingdom of God is within you."
Lets start by the idea of Heaven. It is perfection, it is peace, it is a blissful paradise that human beings dream of, no war, no "sin", no pain, no hatred. Etc. The metaphor comes into play as he states that the kingdom of God (heaven) is within you. He doesn't mean that when people die they go inside of you, and that there are "angels" inside of you, or that God lives inside of you and grants "prayers" from within you to other people. The Kingdom Of God exists within you. Every person on this earth has the ability to make paradise, every person on this earth has the potential to be nice and "sin" free. Thats what the metaphor is. You have the power to make this world heaven, you have the ability to make life heaven just by being in this world and being, well, Humane.
Dont you see, Heaven doesn't exist as a fairy tale land where everything is perfect... Heaven is on Earth, its a Theoretical place that CAN be put into play, but isn't because of the the 7 "sins". These aren't "sins" that grant you passage to hell. These are humane problems that when overcome within every person through the right education has the potential to "bless" our world as the Theological "Heaven".
But it won't work, especially in Religious people... Why? Well simple, they believe Heaven is a real place, they believe that prayer and being dedicated to their religion will grant them passage to heaven. And obviously when Religious people do "bad" things, they have their own ability to "twist" the rules around to make themselves be forgiven; say when they see someone drop a wallet: "Oh, God has blessed me with money that i need to feed my family." or if they don't think its right to take the wallet they just tell themselves "I'll pray hard and go to church more to repent my sin." Though they practice their sins daily just to get them "forgiven" by their church.
The dismissal of these sins in general will create this Metaphorical Heaven existent. But if one just dismisses the sin to be "Forgiven" easily by just going to church, they'll commit them on a regular basis... Ruining all chances of "peace on earth".
Remember, Everything starts small. It grows with time.