However, there is so scientific evidence that shows that rebirth is possible. However, there is no evidence to say that rebirth is impossible. Scientists claim that there just has not been a conclusive case of rebirth yet.
Before responding to this let us examine both the western religions, such as represented by Christianity and Buddhist afterlife theories. According to Christianity, God creates a new soul that becomes a human being which lives its life and then dies. After death the soul will go to eternal heaven if it believed in Jesus, or to eternal hell if it did not.
According to Buddhism, it is impossible to fathom the ultimate beginning of existence. Each being lives its life, dies and then is reborn into a new existence. This process of dying and being reborn is a natural one and can go on forever unless the being attains Nirvana. When a being does attain Nirvana their understanding, and consequently their behaviour, alters and this changes the process which causes rebirth. So instead of being reborn into a new existence the being attains Nirvana. Nirvana is not existence (to exist means to respond to stimuli, to grow and decay, to move in time and space, to experience oneself as a separate etc.) and it is not non-existence in that it is not annihilation. In other words each being's existence is beginningless and endless unless Nirvana is attained and until that time existence has no other purpose than to exist.
There is little evidence for either of these two theories. However, there are several logical and moral problems with the Christian theory which are absent from the Buddhist theory and which make the latter more acceptable. Christianity sees existence as having a beginning but no end whereas Buddhism sees it as cyclic. Nature offers no examples of processes which have a beginning but no end. Rather, all the natural processes we can observe are cyclic. The seasons go and return again next year. Rain falls, flows to the sea, evaporates, and forms clouds which again fall as rain. The body is made up of the elements we ingest as food; when we die the body breaks down and releases its elements into the soil, where they are absorbed by plants and animals which we again eat to build the body. The planets circle the sun and even the galaxy containing our solar system slowly revolves. The Buddhist theory of rebirth is in harmony with the cyclic processes we see throughout nature whereas the Christian theory is not.
Christians claim that God created us for a purpose - so we can believe in him, obey him and be saved. if this is so it is very difficult to explain why, each year, millions of foetuses naturally abort, and millions of babies are born dead or die within the first two years of their lives. Further, millions of people are born and live their whole lives with severe mental retardation, unable to think even the most simple thoughts. How do all these people fit into God's supposed plan? What purpose can God have in creating a new life and then letting it die even before it is born or soon after its birth? And what happens to all these beings? Do they go to heaven or hell? If God really created us with a plan in mind, that plan is certainly not very obvious. Also, as the majority of the world's people are non-Christian and as not even all Christians will be saved, this means that a good percentage of all the souls that God creates will go to hell. God's plan to save everyone seems to have gone terribly wrong. So although we can't prove either the Christian or the Buddhist afterlife theory, the Buddhist doctrine is more appealing and acceptable.