Final answer:
The afterlife was the most important aspect of Ancient Egyptian religion because it provided the opportunity for eternal life and reward or punishment based on one's actions in life.
Step-by-step explanation:
The afterlife was the most important aspect of Ancient Egyptian religion because it provided the opportunity for eternal life and reward or punishment based on one's actions in life. The Egyptians believed that after death, the soul would be brought before a judge of the gods who would weigh the heart against the ideal of order. If the person lived a righteous life, their heart would balance and they would be rewarded with eternal life. This belief in the afterlife influenced the practice of mummification and the construction of elaborate tombs, such as the pyramids, to preserve the body and provide a comfortable afterlife.