This is how Satan works. Those false teachers are liars with false claims.
If people come with false teaching, they are liars; they are making false claims. They are in the pocket of the devil; they are just like him, though they may not know it. They may be blind to that but they know that the exaggerated stories they tell are not true. Their hearers may be innocent people who are misled; they may be good Christians, but their leaders and the extreme people you see on the television, they know what they are doing. They know they have made this up and made that up. They know that the first thing that comes into their heads is not necessarily a revelation of God. And you see some of them, they so swagger, they are such unreasonable people. They know this much and they will be judged for their own dishonesty, even if they are not aware that it is Satan who is controlling them.