Muslims believe, God is the Creator and the Sustainer of the universe, Who created everything for a reason, and He created humankind with a simple purpose – to obey and submit to Him willingly (using their free volition) and without any compulsion. He raised Prophets / Messengers among humans to guide people in fulfilling their purpose of life, for which they were created. Some of these messengers include Adam, Noah, Abraham, Moses, Jesus, and Muhammad (peace be upon all of them). They all taught us through a consistent message about God by affirming His greatness as the Creator and Sustainer, and guiding people to obey and to submit to Him alone. This universal concept has always resonated with mankind’s natural and innate disposition as a human being; and whenever the humanity misplaced the prophetic guidance, they ended up innovating things about God, for which they had no evidence.
Muslims believe that Muhammad ﷺ was the Final Messenger of God, and that after him, no new messenger would be raised for the guidance of mankind until the Day of Resurrection.
Fully accepting the Oneness of God is to accept that He (Allah) is distinct from everything else that exists. It would not suit Gods’ majesty and glory to associate the limited attributes of His creation to Him because He is not restricted in any way, while His creation is. He is the First with no beginning and the Last with no end. Everything in the universe was created by His will. He is not confined by space or time and He is the only One who is in control and provides for His creation.