Nicheren states : " Neither the pure land nor hell exists outside ourselves; both lie within our own hearts. Awakened to this truth, one is called a Buddha; deluded about it, one is called a common mortal. The Lotus Sutra reveals this truth, and one who embraces the Lotus Sutra will realize that hell is itself the Land of Tranquil Light.
He also states: "The word jigoku or "hell" can be interpreted to mean digging a hole in the ground. A hole is always dug for one who dies; this is what is called "hell." The flames that reduce one’s body to ashes are the fires of the hell of incessant suffering. One’s wife, children and relatives hurrying one’s body to the grave are the guards and wardens of hell. The plaintive cries of one’s family are the voices of the guards and wardens of hell. One’s two-and-a-half-foot-long walking stick is the iron rod of torture in hell. The horses and oxen that carry one’s body are the horse-headed and ox-headed demons, and the grave itself is the great citadel of the hell of incessant suffering. The eighty-four thousand earthly desires are eighty-four thousand cauldrons in hell. One’s body as it leaves home is departing on a journey to the mountain of death, while the river beside which one’s filial children stand in grief is the river of three crossings. It is useless to look for hell anywhere else .
The implication here Hell or what u call heaven is found nowhere but in the life of a person of amid such realities of daily living.
Paradise or heaven of what islam teachings is the same like this idea. You are looking after death a beautiful land where u can live peace and happiness forevermore and eternity. And this is not the case of genuine Buddhism.
Hell and buddhahood or true happniess is not found somewhere else but in our own life while we are still living. As Nichiren wrote, "If the minds of the people are impure, their land is also impure, but if their minds are pure, so is their land. There are not two lands, pure and impure in themselves. The difference lies solely in the good or evil of our minds." (Here "evil" means self-centered and shortsighted actions based on greed, arrogance, fear and aggression.)