Jehovah's Witness's

But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who brought them, bringing swift destruction upon themselves. (2Pet 2:1)

The watchtower society better known as 'Jehovah witnesses' was founded by Charles Taze Russell in the 1870's. It is a massive organization with ~6 million members. They claim that divine guidance only comes through the watchtower society, that JW's alone have the truth of God and that they alone are the people of God. They believe that christianity is an apostate religion that has deceived people for over 1800 years. Read on and you will find where they have strayed from the truth and fallen from grace.