A prerequisite of a Holy Person is truthfulness, and a prerequisite of a Holy Religion for the teaching to be truthful. Being truthful is not the whole of the Holy Path, only a small part, but a great way to appraise the various religions on the earth today.
The religions with the greatest number of followers on the earth today claim heaven after death for believers. One difficulty in appraising the claim of enjoying eternity in the heavenly state with family, friends, and other followers of the religion is obvious because of being dead.
Some religions say that if you do not follow their doctrine you will die and go to a fiery realm to be tortured forever. Some go into great detail about the horrors inflicted upon unbelievers, but as far as I know, no one has ever returned to speak of the endless suffering after death. I am far more likely to hear about suffering upon the earth and death as a release. Oftentimes I hear a person is in a better place after death.
Some religions have different points of view and say that after death you will be born again on the earth, and not necessarily human. That is the position I have held since an early age, just because it is clearly visible in the yearly cycle of birth, growth, flowering, wilting, dying, birth, and so on. People are like perennial plants rather than annuals and sprout up again and again.
I know of no one who recently died and returned to the earth to say what happens after death, and know of no one who knows someone who has. One thing to consider about that is the body does not go anywhere other than buried in the ground, burnt in fire, or scattered by scavengers at death. The five senses of sight, hearing, taste, smell, and touch are connected to the body and the body is gone, and nothing remains to enjoy or suffer.
Now, I know the position of the Veda, the Sacred Knowledge of heaven, and to follow and master the teaching the claim is the heavenly state is attainable on the earth. Attain enlightenment and a golden light proves the doctrine, and a Holy Action to show others the way on the earth. The Veda claims there is the only way to oneness with the one who created it all. The doctrine is provable through effort, and I practice, but truthfully, have a long way to go.
For those to consider, the Holy Doctrine is compassion for all creatures that grasp for the breath and cry. Eat a vegetarian diet, be a peaceful kindly person, enjoy the earth and all the creatures of the land, water, and air, and if one is suffering, care for them. It does not matter if they have two feet, four feet, or no feet and speak in a language you do not understand, treat them kindly so all can enjoy life upon the earth. Such is the Holy Doctrine for the whole of the earth and here is a mantra to consider.
To serve as a heavenly protector on the earth do not deceive and the three steps establish the order to the highest.