When we tie our identity to something infinite, as opposed to something finite that will come to an end, and derive our purpose and value from there (i.e God) only then can we come to terms with duties, challenges and opportunities that may change over our lifetime. Hence our understanding of our true identity as a human is of upmost importance.
What We Need to Know about a Post-Modern World and Islam- Part 2
In contrast to the postmodern worldview where there is no objective truth/reality or authority, Islam clearly states there is one and only one legitimate authority- God.
The foundation of Islamic thought is Tawhid or the oneness of God. This term is sometimes misunderstood as there being one numerical God, but in reality, the concept of Tawhid is much deeper. Tawhid in Islam is fundamental, and the core of the Islamic worldview.