Islam’s cornerstone, core, and supreme aim is tawheed, or maybe the unity of Allah. It necessitates that Allah be the exceptional object of all functions of worship. The 2 statements of faith (Shahadatan) that Muhammad is Allah’s Messenger and that there's no other god deserving of worship encompass this idea. https://kmyacademy.com/reality-of-tawheed-inward-outward-actions/