Salam
The term in 31:6 is ' lawha hadeethi'. We have previously told you that the term means 'useless talk' and also explained how the phrase does not include harmless talking or exchange of information.
31:6
And of the mankind (is he) who purchases, idle tales to mislead from (the) path (of) Allah without knowledge, and takes it (in) ridicule. Those for them (is) a punishment humiliating.
31:7
And when are recited to him Our Verses, he turns away arrogantly as if not he (had) heard them, as if in his ears (is) deafness. So give him tidings of a punishment painful.
In 31:6, Allah is telling us about a kind of people who collect or purchase idle talk/ baseless information about the religion with the intention of misleading others without verifying the authenticity of the religious knowledge he/she gained and is now spreading. This particular kind of people do this knowingly in order to mislead and they do not take the repurcussions of such an action seriously. They take the job of spreading the message about true religion like a sport ( they do not give this the importance it deserves). Can u imagine taking the issue of dawah not seriously? And spreading unverified information as authentic message of God? If someone does this knowingly, this person is knowingly lying about Allah. This is a very serious matter. Even if u do it unknowingly, u end up lying about Allah. So, do not talk about God and religion if u r not sure about the authenticity of the information u r spreading.
In 31:7 , God continues to tell us about the characteristics of such people, that when the true verses of Allah are recited to them, and what they are doing is exposed as a great sin, they refuse to acknowledge their actions and act as if they are deaf. And they continue to do what they were doing as if they have not been warned at all. Instead of stopping the spread of unverified religious information, they continue spreading it in order to mislead millions. For these people, God has reserved severe punishment.
These verses are not talking about the Bible or any other scripture, we know that the Quran says that the Bible has been misread or themes have been misrepresented, but the Quran does not say that the Bible suffered a wholesale corruption. But, if you do not possess enough knowledge and cannot discern between which verses of the Bible have been mistranslated, then the directive for you or any such person is to not spread that message.
We are asked not to talk about God if we are not sure that whatever we are saying is true and authentic. If we are in doubt, it is better to keep quite than lie about God and mislead others as well.