How should the believers respond seeing the people engaged in false discourses about Al-Qur'an or deceived by the life of this world?

Verses 68-70 of Chapter 6:

And when you see those who enter into false discourses about Our communications, withdraw from them until they enter into some other discourse, and if the Shaitan causes you to forget, then do not sit after recollection with the unjust people. And nought of the reckoning of their (deeds) shall be against those who guard (against evil), but (theirs) is only to remind, haply they may guard. And leave those who have taken their religion for a play and an idle sport, and whom this world’s life has deceived, and remind (them) thereby lest a soul should be given up to destruction for what it has earned; it shall not have besides Allah any guardian nor an intercessor, and if it should seek to give every compensation, it shall not be accepted from it; these are they who shall be given up to destruction for what they earned; they shall have a drink of boiling water and a painful chastisement because they disbelieved.