Then there is the belief of reincarnation, where after death one is then reanimated back to Earth as a new living being. Buddhism, Hinduism, Jainism, and Sikhism all believed in reincarnation. These religions believed that reincarnation is cyclical and an endless Samsara, unless one gains spiritual enlightenment that ends the cycle leading to liberation. Reincarnation doesn't divide death and life in fact in puts the two together where you have life you have death and can not have one without the other.
What is said in science is that energy can neither be created nor destroyed, meaning that energy is always changing based on the law of conservation of energy. Meaning that as we die we still live on though it may not be in the same form we continue to live. My mother said that we are tied to people in this world, that we have met that person in earlier lives hence deja-vu, and we can tell by the "vibe" we get when with them. That feeling you get when your with someone and you feel that you've known them forever. This feeling is what we keep coming back for, until we become connected with this person and reach spiritual enlightenment to move on from these worldly things.
This is one of the greatest mystery and fear that we as a species become concerned over because we have become attached to this world and dont want to leave it, while in fact we were made for it. We are tied to it.