Surah Al An'aam Notes (20-22)

Those to whom We have given the Scripture recognize it as they recognize their [own] sons. Those who will lose themselves [in the Hereafter] do not believe.

And who is more unjust than one who invents about Allah a lie or denies His verses? Indeed, the wrongdoers will not succeed.

And [mention, O Muhammad], the Day We will gather them all together; then We will say to those who associated others with Allah , "Where are your 'partners' that you used to claim [with Him]?"

(6:20) People of the Book recognize the Prophet just as they recognize their own children
Allah says, the People of the Book know what you brought them, O Muhammad, as they know their own children. This is because they received good news from the previous Messengers and Prophets about the coming of Muhammad, his attributes, home land, his migration, and the description of his ummah.

(6:21) There is no person more unjust than he who lies about Allah and claims that Allah has sent him, while Allah did not send him. There is no person more unjust than he who denies Allah's proofs, signs and evidences. Surely, both of these people will never acquire success, whoever falsely claims that Allah has sent him and whoever refuses Allah's ayats.

(6:22) The polytheist shall be questioned about the shirk they committed
This is on the Day of Resurrection, when Allah will ask the polytheist about the idols and rivals that they worshiped instead of Him.