109 – Al Kaafirun – Those Who Cover Up

The whole chapter is a direct address to those who defiantly covered up the truth and rejected Divine guidance. 
It was revealed in response to a proposal from the leaders of Makka, who approached the Prophet and offered a compromise of worshipping each others Gods in alternate years and/or to abandon his religion in exchange for wealth, women and position. The Quraysh did not reject the concept of a Divine Creator but they did not wish to be dictated by Divinity and wished to make up their own rules. 
The Prophet went up to them and addressed them with this chapter, creating a unique identity based on religion (deen – that which one has based his life on).