Can Allah lie to disbelievers in the Hereafter as a form of mockery, and is it true that the polytheists will be told: "Come forth to Paradise," and when they proceed, they will fall into Hellfire?

We advise you to avoid delving into the elaboration of specious arguments concerning the Lord of Glory and Majesty, for falsehood is impossible and utterly inconceivable with respect to Allah, by the consensus of Muslims.

What is stated in the texts is that Allah will punish the disbelievers by deceiving them, mocking them, and ridiculing them, a recompense of the same nature as their deeds. As for what you have conveyed, we have not found any basis for it. Rather, what is stated in the Sunnah is the vision of Allah on the Day of Resurrection, during which the Jews will be asked whom they used to worship, and they will say, "Uzair is the son of Allah," whereupon it will be said to them, "You have lied," and then they will be driven to the Fire.