In this Surah Allah tells His Messenger (Peace and Blessings upon Him) to give His message to all the disbelievers including the Christians and Jews who reject His Messenger Mohammad (Peace And Blessings Upon Him) and His Holy Book of Qur'an. In the tradition, Messenger advised the Believers to read this Surah at bed time since this will disconnect you from all the false worships.
The Pagan's Ancestral worship was not only one kind but worship of different deities such as Sun, Moon, Stars, idols of gods and goddesses in human or animal forms, human spirits, the pious dead Reverends and their graves. This meant that they gave the Attributes of Allah to their falsehood and makes Allah's own Creation His partners in different time and age these ways of worship varied, such as different disbelievers follow different worship. It has never been one only kind of worship that all the disbelievers followed. Even today same is in practice. For symbolic idols may be instruments for safe guarding the privileges of selfish priests and their ambition, greed or lust of private individuals. In comparisons all the Believers follow One way of worshipping One True God Only, which is the True worship that Islam teaches us.

Here Allah gives order to His Messenger (Peace And Blessings Upon Him0 to tell these Pagans that I worship only One true God, the Lord of you all as well as mine and I have firm believe that no one shares in His Realm. But you on account of vested interest have not the will to give up your false worships which are wrong and has no value.

Allah says to His Messenger ( Peace And Blessings Upon Him) to tell them that I have been given the Truth and cannot at all come to your false ways, you having your vested interest, will not give them up therefore the responsibility is yours, since I have already shown you the Right way. And for my way, the responsibility is mine. You will not succeed to ask me to give up my way of worship. Our consequences are different as well when we see the Reality on The Final day. Your persecution will be in vain. The Truth must lead in the end. So hold fast to the Truth to be successful in both the worlds.

The Summary is taken from the Book "The Pearls Of Wisdom" by Mrs. Badria Kazim (May Allah shower Blessings And Mercy upon Her)

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A teacher by profession and loves to pen articles