Because at the moment there is no accepted evidence of souls and afterlife, and the acceptance would make the belief a fact
Sciencs accepts the theory of Evolution and has proof that Humans and Apes had common ancestor, hence Apes are our cousins and that we as Humans arrived here due to evolution, adaptation (to climate, i.e different skin colour) and natural selection over millions of years
Science thinks that the soul concept was invented by arhaic people to differentiate between a living being and a dead one, they reffered to it as breath. When they couldn't explain phenomena they concluded that the breath (soul) went to God (Phenomena that they couldn't explain), hence the soul-god association and continously transmitted.
Nowadays more and more people say that there is no need for a soul as the brain does everything and hence deny the soul afterlife and god existence as there is no accepted proof of their existence
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