They didn't believe in "life after death" like Christians do. After death, your soul got rigorously tested. And if it passed the tests, you got to the afterlife

They didn't believe in "life after death" like Christians do. After death, your soul got rigorously tested. And if it passed the tests, you got to the afterlife. It was actually a lot more complicated, in that they thought that there seven souls, but whatever. Bottom line, though, was that survival in the afterlife depended on the integrity of your mummy. They removed the brain and internal organs because mummification didn't work, otherwise.