Know the purpose of our creation and the answers to the big existential questions

Allah created us for a purpose, and through adhering to Islam, we fulfill this purpose: to worship Allah alone without associating any partner with Him, and to place our hope and trust in Him alone.
He wants happiness for us in this world as well as in the Hereafter, and He has granted us the key to this true happiness. The Qur'an contains answers to life's greatest mysteries. It pushes us to transcend materialism and realize that this life is merely a fleeting moment before reaching the eternal life in the Hereafter.
Thus, we free ourselves from worshipping and being enslaved by objects, systems, and human-made ways of life, becoming devoted servants of Allah, recognizing that He is the owner of all things.
To be a Muslim means to completely submit to your Creator and acknowledge that we were created for no other purpose than to worship Him. This is the ultimate purpose of our existence here on this earth, in this seemingly infinite universe: to worship Allah alone.
Embracing Islam liberates us from the one sin that may be unforgivable: associating partners with Allah (shirk).

“And I did not create the jinn and mankind except to worship Me.” (Qur'an 51:56)
“O my people, worship Allāh; you have no deity other than Him.” (Qur'an 7:59)

It must be emphasized that Allah does not need our worship; rather, we humans are the ones who need Allah. We need the sense of security and peace that comes from worshipping Him.