A questioner asks why does it matter if I associate partners with Allah? Why is shirk such a big sin? Why is shirk as major as murder or adultery?
It is all about rights. It is our responsibilities to fulfil others rights. When we look at the creation of heaven and earth, then we have to look at what Allah has done.
Allah’s actions are things that no one else can do. Understanding who He is and what He does is extremely important. We must show our thanks to Allah for all of the amazing gifts He has given us.