Egyptian mythology

Hello all ,

Do you know why Egyptians momified their kings bodies and build pyramids ,temples and left us a lot of history in Hyrogliphic symbols?

Probably you think of many answers.

But, to cut it off shortly, i tell you the real answer as we studied the ancient Methology of the Egyptians.

It is that, they believed in an after life,

So most important question is: what made them believe in another life after death?

Waiting your suggestions.