Pullman has clearly stated (more recently, that interview is 2002, 12 years ago) he's an Atheist (Certainly a Richard Dawkins supporter) and that he hates Lewis, Narnia, Religion and specifically Christianity. He makes it clear frequently on BBC R4, now, what his aim is. The series was dishonest.
After he was established as a Fantasy Author.
Lewis on the other hand was a well established, famous Christian Apologist long before Narnia was published. There was no false pretences.
I enjoyed "His Dark Materials" Northern Lights at the start, I thought it was clever, then I thought it was dishonestly clever. I felt dirtied, manipulated and cheated.
I'm fine with people being anti-Christian and writing Fantasy. I'm not so happy when they hypocritically attack dead people claim they have done something that they themselves are more guilty of.