Validity: The premises faithfully reflect the passage's reasoning: premises 1–2 establish the historical theological basis, premises 3–7 elaborate the Quine worship example to show the extrinsic nature of such changes, and together they directly support the conclusion that DDI permits extrinsic changes while ruling out only real and intrinsic ones.
Confidence: High confidence. The argument is explicitly laid out in the passage with clear premises and conclusion.