>>23482080It's Sola Scriptura.
False religions typically reject Sola Scriptura, because if one actually tries to seek out God by esteeming what they think is His Word above all of man's ideas they will find Him.
My son, if you will receive my words
And treasure my commandments within you,
To make your ear pay attention to wisdom,
Incline your heart to discernment;
For if you call out for understanding,
Give your voice for discernment;
If you seek her as silver
And search for her as for hidden treasures;
Then you will understand the fear of Yahweh
And find the knowledge of God.
— Proverbs 2:1-5
To give a concrete example, this is why Satan does not want followers of the religion that he spawned to study the Qur'an alone:
He has revealed to you ˹O Prophet˺ the Book in truth, confirming what came before it, as He revealed the Torah and the Gospel previously, as a guide for people, and ˹also˺ revealed the Decisive Authority. Surely those who reject Allah’s revelations will suffer a severe torment. For Allah is Almighty, capable of punishment.
Qur'an 3:3-4
>God revealed the Gospel.>Unbelievers will be punished.The Word of your Lord has been perfected in truth and justice. None can change His Words. And He is the All-Hearing, All-Knowing.
Qur'an 6:115
>The Word of God does not change.Note that no Muslim believes all three of these things, because if they did, they wouldn't be a Muslim.
They don't believe these things, because demons distract them with Hadiths, so they don't actually grasp the full implications of their own central text.