You get 10 protestants from 10 different denomiations together and ask them to interpret 1 passage from scripture for you and you are likely to get 10 different answers. Hence we get a new denomination every 2 days in the US on average.
Ya, someone is "assuring" these people of their interpretation, but it ain't the Holy Spirit, who is God and neither wishes to deceive nor can He be deceived.
The fact is, human beings cannot stand authority - we rebel against it constantly. We just can't stop believing the first lie of the serpent - God is a tyrant whose rules are preventing us from attaining true happiness. This is the lie that keeps on giving
Bless you! You have earned an A+ on your report.