Warning about deception and false teaching

If we exaggerate some aspect that occurs only seldom in the Bible we risk becoming out of balance and introducing a false teaching or false practise.

How many times is speaking in tongues mentioned? (Pentacostals) Acts 5x; 1 Corinthians 12x
Should we keep the OT dietary law? (SDA) no
How many times is Armageddon mentioned? (JWs) Revelation 1x; WT literature has mentioned it more than 10,000x.