Is it a valid response to one who argues that good intention accompanies his misguidance to say that the Christians had good intentions, yet Allah ruled that they were misguided?

Question:
He asks: Can we respond to him by saying that the Christians had good and pure intentions, and yet they became misguided?

Answer:
We do not say "the Christians" or "so-and-so" or "so-and-so." We say: It is necessary, it is necessary for sincerity and following. It is necessary for two things: sincerity to Allah and following the truth, following the Messenger of Allah (peace and blessings be upon him). Yes.