The ancient Egyptian belived in afterlife. And that was why the mummified the dead in preparation for this.
The idea of the afterlife appealed to the ancient Egyptians because they thought that one day the people they put in the pyramids would rise for the dead and would go into the afterlife.
The tombs of the ancient Egyptian pharaohs and nobility are filled with items that would be needed in the Egyptian afterlife. Also the uncovered writings of the ancient Egyptians speak about the afterlife.
The ancient Egyptians mummified their pets and animals because they wanted them to go to the afterlife with them.
The ancient Egyptians believed that when they died their spiritual body would continue to exist in an afterlife very similar to their living world.
It was the belief of the ancient Egyptians that the way they would experience the afterlife as a soul or "ka" would be influenced by the way their body is prepared through mummification.
so that in the afterlife, the spirits would be recognizable
they thought that it would protect the mummies in the afterlife.
They believed they would go to the afterlife after they died
the way they believed it by the aferlife and they saw one of there elders die and then they had a animal next to them
So that the dead people would have clothes in the afterlife.
The ancient Egyptians believed in mummies because they had a strong belief in the afterlife. Once they had the dead bodies they would wrap them. Then Egyptians believed that gods would weigh their life against a feather and if had a good life they would make it into the afterlife. The afterlife was said to be another world for dead people. So the Egyptians believed that mummies would live in the afterlife.
If the Egyptians pleased the gods, they believed Egypt would prosper and that they would have a peaceful afterlife. If they, however, did not please the gods, Egypt would not prosper and in the afterlife, Osiris would not look kindly upon them and they will have a chaotic afterlife. Hope this helps!