Heresy.

heresy

ˈhɛrɪsi/

noun

1. belief or opinion contrary to orthodox religious (especially Christian) doctrine.
2. Universal salvation; unitarianism; salvation by works not Grace; downgrading of Scripture; abolition of hell; man 'knowing better than God'?
3. Welcome to the world of cults and heresies. The problem is that you are nearly as likely to encounter these things in churches which were once beacons for the lost as you are in outright cults.