Jesus said "Not everyone who says to Me, ‘Lord, Lord,’ shall enter the kingdom of heaven, but he who does the will of My Father in heaven. 22 Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’"
There are many false teachers out there. Some of the well-known ones are Benny Hinn, Joyce Meyers, Joel Osteen, Creflo Dollar. So many fall victims to their false Gospel (Prosperity) because they can't differentiate between the good and bad ones.
The Bible says in 1 John 4: 1
"Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world."
But we can only know if it's a false teacher if we know what the Bible says. That's why we have to read/study the Bible for ourselves. Here is a couple of verse addressing that:
"until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ. Then we will no longer be infants, tossed back and forth by the waves, and blown here and there by every wind of teaching and by the cunning and craftiness of people in their deceitful scheming."
Ephesians 4: 13-14
"For this reason, since the day we heard about you, we have not stopped praying for you. We continually ask God to fill you with the knowledge of his will through all the wisdom and understanding that the Spirit gives,
10 so that you may live a life worthy of the Lord and please him in every way: bearing fruit in every good work, growing in the knowledge of God,"
Colossians 1: 9-10
