It is imperative for us to know the true meaning of Islam in order to fully understand what it means to be a Muslim. The word Islam originates from the
First your heart has to believe in the Oneness of Allah sincerely, based on knowledge, so the first step is to know about Allah through the Book He revealed to us (the Quran) and to use the rational proofs found in His creation. In everything from the creation of Allah, there is a sign proving His Oneness and Perfection. All of the creation and what it contains from perfect wonders and the absolute wisdom, indicates the perfection of Allah’s power, will, wisdom and mercy.
Explaining Tawhid by Shaikh Muhammad ibn Al-Uthaimin. Click on the link to read/download the pdf: Explaining Tawhid