Hinduism is originally not a religion rather is civilization derived from Hindu Kush (Indus Valley). Strong Religion, culture, community or society's behaviour all together form civilization. Indus Valley had many small-small religions founded during settlement of groups. Each group had deity and own god to follow, therefore, you can perceive Hinduism has so many Gods. There were two major religions 1st Shaivism and 2nd Vaishnavism.
Hinduism was too vast to handle thus corrupted due to Brahmin dominance and new religion emerged 'Jainism' and 'Buddhism'. In other words Hinduism is huge tree with many branches like - Buddhism, Jainism, Sikhism, and others. They all emerged as a result of religious crisis, similar to Judaism to Christianity and again break up to catholic, orthodox and so on. From barbaric religious rule to Islam then again break up to Shia and Sunni. All the religions and their inscriptions are same for betterment of the society. All the regions have Heaven and Hell to restrict unlawful practices that harms peaceful society.
Now your point Life after death - Is typical and complicated topic and may be joke for some. However, my explanation is - Are we electronic device? Battery goes off and we are finished. There has to be some force controlling our behaviour if not each one would have behaved same way. But some are very lucky and some looser, some are angrier, more pleasing, obstinate, fool, and intelligent and so on, why we react to surrounding environment? What forces us to get attracted? How Jesus touched one and got cured? Jesus was born on day rising glittering star. What was that? How 3-4 strangers from East came to know and visited to honour the divine birth. Planetary position is important during birth, so planets control us as sea waves by the Moon. These questions we ordinary people cannot answer, but drove sages to realize that all living species are part of energy and each individual has own energy field, in other words is Aura. Widening and narrowing energy field depends on what you sow you reap. A goal is fixed by God (unexplainable to me), is from super people of other planets, or Abraham or Shiva, or Energy rays of planets. I dont know what I know is that there is some force that controls and we are tools. One has to achieve energy field fixed and has to go through the cycle of birth and death. One more point is that we are the creator of negative and positive environment on living earth. When negative environment reached extreme some force emerges to revive to positive but when positive environment reaches extreme it stinks and invites negative. This is what happened to all the religions, was introduced for welfare and security but over the time decayed to split up for new ideological religion. Sorry if it hurts anyone and I ask for pardon