1. The debt we owe God can only be paid with submitting our will to God’s will. All the rituals of worship that Muslims are supposed to perform are to preserve the deen itself.
Life: Life is obviously sacred in Islam. The Qur’an says,
One who kills a soul unjustly, it is as if he has killed humanity and the one who saves a soul, it is as if he has saved humanity. (Yusuf Ali Translation, 5:32)
Intellect: Next to life, sharia seeks to protect and preserve the intellect of human beings. Anything that affects the intellect is forbidden. This explains the reason behind the prohibition of alcohol (and by extension, all kinds of mind-altering drugs).
Property: Sharia seeks to protect the right of people to own property and that is why there are penal laws that govern the breach of this right when people steal from others.
Lineage/Honor: Islam seeks to protect the lineage and honor of people. This explains why Muslims have rules such as giving people the benefit of the doubt, discouraging spying on one another, backbiting, free intermingling between the sexes.
In Islam, sharia is the ideal that Muslims need to aspire toward. The essence of worship is what’s important, and Muslims believe that God has delineated those means of worship through sharia.

2. Abstaining from gossiping and backbiting
Prayer
Hijab for women
The prohibition of drinking alcohol
Prohibition of intimacy with the opposite gender before marriage
The prohibition of smoking
Proper slaughtering of animals for food
Death penalty for the murderer
Zakah
Marriage
Abstaining from gossiping and backbiting