The simple answer is that they don’t believe their Bibles, or Jesus’s Words, or the Words of the Prophets.
Jesus berated the Pharisees for holding onto their traditions more than Scripture and Prophecy. Mark 7:1-13 is a perfect example of this.
Cults, Catholics, and other strange pseudo-Christians believe all sorts of bizarre and superstitious things.
They add to God’s Word - they even admit that they do and they will pummel you heavily if you try to steer them back to Scripture.
I imagine all of them are in for a good horse-whipping from The Lord on Judgement Day. How many vulnerable, lazy, cowardly, and weak people did they help drag to hell because they couldn’t find the courage to read the entire Council of God?
Look who's talking:
22 When he had said this, he breathed on them; and he said to them: Receive ye the Holy Ghost. 23 Whose sins you shall forgive, they are forgiven them; and whose sins you shall retain, they are retained.
Preach It!
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Do what we can and hope the Holy Spirit
Brings them to the TRUTH.
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IT’S There in Black and White.