Mughal1 I have a different understanding though I might be fully wrong.
True, Islam is a religion which requires from us to follow it in all aspects of our life. However, I believe it is a gradual and continuous process as it is not possible to understand and follow all aspects of Islam from the day one is born/matured.
So in this process of learning & improving, we may slip many a times, as we are prone to mistakes. And many times, we get lost in our routine and local priorities which can last for extended time too. In some cases, we may even reach near to a destruction point.
Taubah is an institution which provides a way back to the Almighty Allah. It brings us back so that we can start/restart/resume our way to Allah. And it may take multiple slips and fall backs.
As far as we keep on going back to Almighty Allah and seek repentance, we are not far from Him. And "Indeed Allah loves those who are constantly repentant.” (Holy Qur’an 2:222)