What is required to enter Islam?

Shaykh Abdur-Razzaaq Al-Abbaad said:
Entering islam is not achieved by merely acknowledging Allah’s lordship; that he is The Creator, The Sustainer, The bestower of blessings and The Disposer of all affairs, but rather it’s a must along with this to come with the obligations of this recognition, which is none other than that He, the Most High is singled out with worship and that obedience is made specifically for him alone and that he is not given any partners along with him and that the religion (all religious duties) is performed purely for him.
Explanation of the 4 principles p.31