Since when was any false teaching unimportant? Who decides which is important and which is unimportant false teaching?
See this evidence of '
Benny Hinn and necromancy (speaking to the dead)'. Is this important or unimportant false teaching.
Gal 1:8 (ESV), 'But even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed'.
We know how 2 Peter 2:1-3 (ESV) warns us about false prophets and false teachers: 'But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them, bringing upon themselves swift destruction. And many will follow their sensuality, and because of them the way of truth will be blasphemed. And in their greed they will exploit you with false words. Their condemnation from long ago is not idle, and their destruction is not asleep'.
False teachers of any kind bring in destructive heresies to the church. No church leader with respect for Scripture will allow any false teaching - that contradicts Scripture - to be tolerated in the church.
When will there be an increase of false teaching? We are warned in 1 Tim 4:1-2 (ESV), 'Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons, through the insincerity of liars whose consciences are seared'.
I am constantly aware of the possibility of false teaching coming from the pulpit and especially from the Internet. We have to constantly be aware of those who 'secretly bring in destructive heresies'. There is no such thing as a false teaching that is not important. We have to alert believers to these destructive heresies.
Oz