Namaz
Every relationship requires some essential rituals to prove that we care about them. Our foremost relation is with God who is our Creator. He is the Lord of mankind, King of mankind, and God of mankind. To Him, we will return. To show our bond with Him, we worship Him, the way He told us. If one disregards prayers, one shows that He does care about God. This attitude displeases Him and He punishes those who disobey Him and refuse to worship Him.