Which of the following is a central teaching of Islam?

One of the central teachings of Islam is to be loyal to the kingdom. The crown, not the throne. The crown is who we follow and serve, not he who steps on the throne. The kingdom of God, that is. If our God wants a baby lamb, we slit a throat right away. We let the blood of the baby lamb water the steps of the Masjid Bilal. It cleanses those who enter and allows them to live a happy life. Our Islamic faith is very powerful, and quite strict. Should we break the rules that our Allah has set for us, we shall exhibit to the following. Taken straight from the Quran of the Islamic faith

Punishment is as follows:
He shall destroy all which he has built
He shall repay all that he has bought
He shall kill all that he has tamed
He shall burn all that he has acquired

Failure to fulfill either punishment will result in (all) the following:
If that which he has built cannot be destroyed, he shall build a nice garden around that which cannot be destroyed
If he cannot repay all that which he has bought, he shall work for him who he has brought from without wages
If he cannot kill all that which he has tamed, he shall find a baby sheep of white wool and bring him to a watering hole. The baby sheep shall be left in the hole with no food. The eternal suffering of the baby sheep shall sacrifice for all that which he has tamed but cannot kill. Should the baby sheep of white wool grow to be a large sheep of white wool, it shall be sheared for three days and its wool shall be kept. After the third day, the sheep shall be killed and it's wool shall be burned over the hole. Another baby sheep of white wool shall be in its place to sacrifice all that which he has tamed but cannot kill
If he cannot burn all that which he has acquired, he shall be thrown into a dark cave, naked of his armor and belongings, guided only by a wolf that which he has tamed. For three days he shall stay in the cave with the wolf he has tamed until he is morally correct. Should the wolf that which he has tamed be killed by himself or gone missing, he shall go up to daylight and build up to 64 blocks of bricks, gathered by his hand. He shall leap and die.

Thanks DrBob222

The central teaching of Islam is the belief in monotheism, known as Tawhid. Muslims believe in the absolute oneness of God (Allah) and that worship and devotion should be directed solely towards Him. This core principle is expressed in the statement of faith, the Shahada, which states, "There is no deity but Allah, and Muhammad is the messenger of Allah." The teachings of Islam also emphasize the importance of following the Five Pillars of Islam, which include the declaration of faith (Shahada), ritual prayer (Salah), giving to charity (Zakat), fasting during Ramadan (Sawm), and performing the pilgrimage to Mecca (Hajj), if financially and physically able. These teachings form the foundation of Islamic belief and practice.