The essence of the Inquisition:
1) is
Do you believe in the devil?
and no.
The devil exists. This is stated in the Scriptures. If you refuse to acknowledge the truth of Scripture, you are a heretic. Burn it up!

2) is
Do you believe in the devil?
and yes.
Your words blame you, O servant of the devil! For as it is said in the Scripture, faith is manifested in service. Burn him.