There are religions such as Buddhism where being reborn is part of their main belief system, and it has long been historically part of their faith that they will come back in another form after their death. Being reincarnated is not just a matter of the promise of rebirth, so it is something to be taken seriously. Buddhist beliefs are based on the tenet that the world we see is nothing more than an illusion, and they point out that everything is connected. This is an important part of their religion, and it weighs heavily on their behavior in their current life.
While this religion does promise people will come back to life after their current body dies, it is up to them to contribute to the form they will have in their next life. Karma has become a popular way to express that people who do bad things will eventually be punished, but it is often misunderstood in cultures that do not have a heavy influence of this religion.
The thought of coming back to life after death is a pleasant one, but the role of karma is the key to how it works. Those who are mean, selfish, greedy, and unforgiving will not come back as a person. they will be demoted within the hierarchy of life, and their next form could be as an insect that will have a difficult life at the best of times. For those who take the thought of their next life seriously, doing good deeds, being a caring and thoughtful person, and being responsible will reward them in the next life.
The end goal of reincarnation is to see through the illusion of the world and connect with the wheel of life. For those who are determined to proceed, it is important for them to live a virtuous life so they may eventually be able to truly reach this stage.